Answer:
52.25 grams of oxygen are produced.
Explanation:
When 34.5 g of potassium chlorate (KClO3) decomposes, it produces oxygen gas according to the following chemical equation:
2 KClO3 -> 2 KCl + 3 O2
This means that for every 2 grams of potassium chlorate that decomposes, 3 grams of oxygen gas are produced. In the case of 34.5 grams of potassium chlorate, this would produce 3 * 34.5/2 = 52.25 grams of oxygen. Therefore, when 34.5 g of KClO3 decomposes, 52.25 grams of oxygen are produced.
the half-life of radium-226 is 1620 years. what percentage of a given amount of the radium will remain after 600 years?
68% of a given amount of the radium will remain after 600 years, the half-life of radium-226 is 1620 years.
Now, we shall proceed to obtaining the percentage of radium-226 that will after 900 years. This can be obtained as illustrated below:
Step 1
Determination of the number of half-lives that has elapsed.
Half-life (t½) = 1620 years
Time (t) = 900 years
Number of half-lives (n) =?
n= t/t1/2
n= 5/9
Step 2:
Determination of the amount remaining
Initial amount (N₀) = 1
Number of half-lives (n) = 5/9
Amount remaining (N) =?
N= No/2n
N = 0.68
Step 3
Determination of the percentage remaining.
Initial amount (N₀) = 1
Amount remaining (N) = 0.68
Percentage remaining =?
Percentage remaining = N/N₀ × 100
Percentage remaining = 0.68/1 × 100
Percentage remaining = 68%
Therefore, the percentage amount of radium-226 that remains after 900 years is 68%
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Which factor causes a decrease in the rate of dissolution?decreasing the amount of soluteincreasing the stirring of the solutiondecreasing the surface area of the soluteincreasing the temperature of the solvent.
lessen the solute content slow down the rate of dissolution.
what is dissolution?By dissolving the solute in the solvent, a solution is created. Dissolution is the process through which solutes that have been dissolved into a solvent form a solution. A solution of the gas, liquid, or solid in the original solvent is created during this procedure.
Solution stirring: Solution stirring results in a greater interaction between the solvent and the solute, speeding up the rate of dissolution.
The solute's surface area is: It is easier for the solute to interact with the solvent when the solute has a lower surface area. Therefore, the rate of disintegration increases with decreasing surface area.
Temperature of the Solvent Because the solvent's molecules have more energy at higher temperatures, more substances often dissolve in it, which increases the amount of molecular interaction between the solvent's and solute's molecules.
Because there is less solute in the solution, there will be less contact between the solute and the solvent, which will result in a slower rate of dissolution (even though a solution will still be formed).
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Atoms from more than 100 elements make up all the matter in the universe. The atoms of two or more elements can come together to make a molecule. When molecules come together, they make a chemical compound. They can form in many different ways and there are millions of compounds that have already been discovered. In chemical reactions, compounds can also be broken down and changes can be made to the way the atoms bond. Compounds have many different characteristics. Compounds can be classified as molecular or ionic. They can also be classified as organic or inorganic. Organic and inorganic compounds can be further classified into subclasses. Is this an accurate summary? Why or why not? (A) Yes; the summary clearly and precisely highlights important facts about how chemical compounds form and other characteristics. (B) Yes; the summary correctly identifies common chemical compounds and explains how to make formulas using compounds. (C) No; the first sentence of the summary incorrectly explains that atoms make up all matter found in the universe. (D) No; the last sentence falsely states that both organic and inorganic compounds can be divided into subclasses when only organic compounds can be.
The summary clearly and precisely with accuracy highlights important facts about how chemical compounds form and other characteristics.
What are compounds?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
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in 25.0 g of a 7.50% by mass solution of caso4: a) how many grams of solute are present? b) how many grams of solvent are present?
a) Solute weight in grams: (25*7.5)/100 = 1.875 gm.
b) Because the weight of a solution is equal to the sum of the weights of the solute and solvent,
Solution weight is 100 grams.
Solvent weight in grams: 100 - 1.875 = 98.125 gm.
Given that water has a density of 1 g/ml, the formula to determine how much solute to add to a solution in weight percent is as follows: grams of solute = (wt% solution) x (ml of water) (100 - wt% solution). The ratio of a solute—a material that dissolves—to a solvent—a substance that does not dissolve—determines the concentration of a solution in chemistry. C = m/V, where C is the concentration, m is the mass of the solute dissolved, and V is the overall volume of the solution, is the accepted formula.
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Which of the following forces is the strongest?
a
ion-dipole interaction
b
hydrogen bonding
c
dipole-dipole interactions
d
London Dispersion Forces
Key computer issues addressed by the bureau of consumer protection (bcp) include all of the following except _____
All of the following are significant computer-related concerns that the Bureau of Consumer Protection (BCP) addresses, with the exception of how to increase the number of "cookies".
What is a consumer ?
Consumers are those who buy products for their own needs and utilise or consume them.
Product liability, privacy rights, unfair business practises, fraud, misrepresentation, and other consumer/company interactions are only a few of the many themes covered by consumer protection. Although a customer cannot resell the good, product, or service, he or she may use it to support himself or herself and engage in self-employment.
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Look at the following reaction:
2Al(s) + 3CuCl₂(aq) → 2AlCl3(aq) + 3Cu(s)
This is an example of what type of reaction?
O Single replacement
O Double replacement
ODecomposition
O Synthesis
Answer:
Single replacement
Explanation: Al is replacing Cu
the fluorine- nuclide radioactively decays by electron capture. write a balanced nuclear chemical equation that describes this process.
The fluorine - nuclide radioactively decays by electron capture. (9+1)18F -> (8)18O + e^- + v_e is the balanced nuclear chemical equation that describes this process.
Radioactive decay is a process in which an unstable nucleus emits particles or radiation in order to become more stable. Electron capture is a type of radioactive decay in which an inner atomic electron is captured by the nucleus, combining with a proton to form a neutron. This process results in the emission of an electron neutrino and a reduction in the atomic number of the nucleus by one.
To write a balanced nuclear chemical equation that describes the electron capture decay of a fluorine-nuclide, we can use the following general form:
(Z+1)A X -> (Z)A Y + e^- + v_e
where (Z+1)A X is the initial nuclide, (Z)A Y is the final nuclide, e^- is the captured electron, and v_e is the electron neutrino. The atomic number (Z) and mass number (A) of the nuclides are indicated in parentheses.
In this case, the initial nuclide is the fluorine-nuclide, which has an atomic number of 9 (Z+1) and a mass number of 18 (A). The final nuclide is an isotope of oxygen, which has an atomic number of 8 (Z) and the same mass number as the initial nuclide (A).
The balanced nuclear chemical equation for the electron capture decay of the fluorine-nuclide would be:
(9+1)18F -> (8)18O + e^- + v_e
It is important to note that this is a general equation for electron capture decay and does not represent the specific decay of any particular fluorine-nuclide. The actual decay of a specific nuclide may involve the emission of other particles or radiation in addition to the electron and electron neutrino.
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Five grams of nitrogen gas at an initial pressure of 3.0 atm and at a 20 degrees Celsius undergo an isobaric expansion until the volume has tripled.
a. What is the gas volume after the expansion?
b. What is the gas temperature after the expansion (in degrees Celsius)?
c.What is the gas pressure after the decrease?
d.What is the final gas pressure?
e. Show the full three-step process on a pV diagram. Use appropriate scales on both axes.
5 gram of nitrogen P1=3 atm T=293k V2=3V1, a) gas volume after the expansion is 4.29L. , b) the gas temperature after the expansion is 606 degree celcius, c) the gas pressure after the decrease is 1 atm, d) final gas pressure is 3 atm.
calculations are a-p1*v1=nRT1= 3*V1 = (5/28) *(0.0821)*293 V1=1.431L so V2 =3V1=3*1.43=4.29L. B- V1/T1=V2/T2=T2=V2/V2 *T1,T2=3*293=879K=606 degree celcius. )P1/T1=P2/T2=3/879 = P2/293= P2=1 atm . d-P1V1=P2V2= 1*4.29=P2*1.43 SO p2=3 atm.The quantity of a system is an essential extensive measurement for describing its thermodynamic state in thermodynamics. gas volume The specific volume, an intensive property, is the volume of the system per unit of mass. The pressure acts perpendicular to the wall (normal); the tangential (shear) component of the force is proportional to the viscosity of the gas. When gas molecules collide with the walls, they produce a force that is perpendicular to the walls. The Gas Pressure is defined as the sum of all such forces divided by the surface area of the container walls. The average linear momentum of the gas molecules is measured by the gas pressure.
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FILL IN THE BLANK. the formal charge on sulfur in so42- is ________, where the lewis structure of the ion is:
The formal charge on sulfur in so42- is 0, where the Lewis structure of the ion is attached in the image below.
Formal charge = # of valence electrons -(number of bond pairs)/2 - number of lone pair electrons
So, formal charge on S = 6-(12/2)-0 = 0
Valence electrons are the electrons withinside the outermost shell, or power level, of an atom. For example, oxygen has six valence electrons, withinside the 2s subshell and 4 withinside the 2p subshell.
Sulfate ion is a very weak base, while HSO−4 is a fairly strong acid, with Ka=0.01. On the other hand, H2SO4 is a very strong acid. Because it is such a weak base, sulfate ion undergoes negligible hydrolysis in aqueous solution.
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a 0.500 l solution contains 12.00 grams of calcium chloride, cacl2 how many moles of cacl2 are dissolved in the solution
In accordance with the stated assertion, 1 mol of Cacl₂will dissolve in the solution.
What in chemistry is a mole?Chemists employ the mole, a highly significant unit of measurement. Like a dozen eggs implies twelve eggs, having a mole of anything indicates we had 602,214,076,000,000,000,000,000 of that item. For extremely tiny objects as electrons, polymers, or other particles, chemists must quantify using moles. A mole is defined as the mass of a material with the same numbers of elementary particles that are atoms in exactly 12.000 g of 12C.
Briefing:You are aware that 1L of solution contains 2 moles of Cacl₂.
In 0.500 L of solution there are
0.500 L soln. * 2.0 mol of Cacl₂/1 L soln = 1 mol Cacl₂
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A certain liquid has a mass of 98.7g. If the liquid has a volume of 56.1 mL, what would be the density of this liquid?
Answer:
1.76 g/ml
Explanation:
98.7 / 56.1 = 1.7593582888
Round to the nearest hundredth = 1.76
which one of these sentences is appropriate for a formal lab report in chm113 lab?a. Three more trials were conducted and the data was recorded. b. First, record the seven concentrations of the red dye which...... c. The corvet was whipped with a soft tissue and then........ d. The error occurred because Tim spilled the solution. e. We got a good yield.
Three more trials were conducted and the data was recorded this is one of sentence appropriate for a formal lab report in chm113 lab.
The phrase "three further trials were undertaken and the data was recorded" is appropriate for a formal lab report in the CHM113 lab. Following the recording of these samples' absorbencies, a standard line curve with the concentration equation and an R2 value was produced using the data. To make it simpler to grasp huge amounts of data and the relationships between various series of data, series of numeric data are displayed in a graphical fashion using charts.
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What is the difference between entropy and free energy? How do they determine the spontaneity and the direction of a chemical reaction?
Difference between entropy and free energy:
Entropy measures the amount of heat dispersed or transfered during a chemical process whereas free energy available to initiate a chemical process and is determined under constant pressure and temperature.Entropy can be thought of as the degree to which energy is dispersed throughout a system whereas free energy are spontageneous.Entropy increases whereas free energy process is spontaneous.The Gibbs equation allows us to predict reaction spontaneity directly from enthalpy and entropy measurements. When a reaction is exothermic, the system’s enthalpy is negative, resulting in a negative Gibbs free energy. As a result, all exothermic reactions are considered spontaneous.
What do you mean by exothermic reaction?
A reaction that is chemical in nature and is characterized by the release of energy in the form of heat or light is called an exothermic reaction. Matching a light using a matchstick is one example of this type of reaction where the release is in the form of both heat and light.
The energy dissipated in an exothermic reaction is transferred into the surroundings. Therefore, the change in enthalpy (a quantity that measures the heat content of a system by calculating the change in energy) is negative in such a reaction.
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The difference between entropy and free energy is that entropy is a measure of disorder or randomness of a system, while free energy is the measure of how much energy is available to do work in a system.
What is entropy?
Entropy is a measure of the amount of disorder in a system. It can be used to describe the uncertainty of a system and its ability to exchange energy. Entropy is a thermodynamic property that can be used to determine the state of a system and its ability to exchange energy with its environment. The entropy of a system increases as the amount of disorder increases. Entropy is related to the number of possible arrangements of the particles in the system and the number of ways they can be arranged. Entropy also relates to the amount of energy that can be exchanged between the system and its environment. Entropy can be used to measure the efficiency of a process or system, as well as the amount of energy needed to maintain it.
Entropy is a measure of how much energy is spread out or available to do work in a system. Therefore, a higher entropy means that the energy is spread out more, while a lower entropy means that the energy is more concentrated. Entropy also affects the spontaneity of a reaction, with higher entropy meaning that the reaction is more likely to be spontaneous and proceed in a certain direction.
Free energy, on the other hand, is a measure of how much energy is available to do work in a system. It is calculated by subtracting the enthalpy from the entropy of a reaction, and it is an important factor in determining the spontaneity and direction of a reaction. If the free energy of a reaction is negative, then the reaction is spontaneous and will proceed in the direction of the negative free energy. If the free energy of a reaction is positive, then the reaction is not spontaneous and will not proceed in the direction of the positive free energy.
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FILL IN THE BLANK. the correct formula for the compound formed from mg and s is ________.
Answer:
MgS thus, magnesium sulphide
if 20 grams of kno3 is dissolved in 100 grams of water at 0 degrees celsius, what type of solution is made?
The type of solution made is unsaturated.
A solution is a homogeneous mixture of one or more solutes dissolved in a solvent. Note that the solvent is the substance present in the greatest amount. There are many different types of solutions. For example, solutes can be gases liquids, or solids.
A solution is formed when one substance dissolves or decomposes into another substance. A substance that dissolves into a solution is called a solute. A substance in which a solute dissolves is called a solvent. In a sugar, solution sugar is the solute and water is the solvent. A solution is prepared by dissolving a known mass of solute in a given amount of solvent.
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What is the electrical charge of a neutron in coulombs (C)?
a 100 ml solution containing 0.100 m nahco3 is treated with excess acid, producing carbon dioxide which is released into the atmosphere. how much work (in j) is done by the co2 if this reaction occurs at 298k and 1 atmosphere of pressure?
If the reaction occurs at 298K and 1 atmosphere of pressure, the work done by the CO₂ is -24.8 Joules.
How to calculate work (in joule) is done by the CO₂ if the reaction occurs at 298K and 1atm of pressure?Work is the energy required to move something against a force. The energy of a system can change due to work and other forms of energy transfer such as heat. Gases do expansion or compression work with the equation W = - P * ΔV.
From the question given
molarity of (NaHCO₃) = 0.1m
Volume of NaHCO₃ (V) = 100ml * 10⁻³ L / 1 ml = 0.1L
T (temperature) = 298k
P (pressure) = 1atm
moles of NaHCO₃
= molarity * Volume in Liters
= 0.1m * 0.1L = 0.01L
NaHCO₃ + HCl -> CO₂ + H₂O + NaCl
moles of CO₂ = moles of NaHCO₃ * (coefficient of CO₂ / Coefficient of NaHCO₃)
= 0.01L * 1/1
= 0.01 mol (moles of CO₂)
so, initial moles of CO₂ = 0
final moles of CO₂ = 0.01mol (based from the calculation)
Δn 0.01 - 0 = 0.01mol
Now, let's use work formula (as mentioned above on explanation part)
Work = - P * ΔV
= - Δn * R *T
Where R = 8.314J / mol.K
= - ( 0.01mol * 8.314 J / mol*K * 298K)
= -24.8J
Therefore, the work done by the CO₂ on this 100ml solution is -24.8Joules.
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identify the acid and conjugate base pair in the following: hso3- + cn- ® hcn + so32-
Here the correct conjugate acid-base pair will be: [tex]\mathrm{HSO}_3^{-} \:and\: \mathrm{SO}_3^{2-}[/tex]
Option (a) is the correct choice.
A conjugate acid-base pair, according to the Brnsted-Lowry definition of acids and bases, consists of two substances that are distinct only in that they contain a proton (H+). When a proton is supplied to a base, a conjugate acid is created, and vice versa when a proton is taken away from an acid, a conjugate base is created.
An illustration of a conjugate acid-base pair is HOCN and OCN-. There is only one proton (H+) that separates the two. Every base has a conjugate acid, and every acid has a conjugate base.
In the given chemical equation:
[tex]$$\begin{aligned}& \mathrm{HSO}_3{ }^{-}+{{\mathrm{CN}^-} \longrightarrow \:\:\:\:\:\:\:\mathrm{HCN}+\mathrm{SO}_3^2}^{2-} \\& \text { acid base } \text { conjugate base } \text { conjugate acid} \\& &\end{aligned}$$[/tex]
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The complete question should be like:
Identify the acid and conjugate base pair in the following:
[tex]$$\mathrm{HSO}_3{ }^{-}+\mathrm{CN}^{-} \rightarrow \mathrm{HCN}+\mathrm{SO}_3{ }^{2-}$$[/tex]
[tex](a) \:\mathrm{HSO}_3^-$ and $\mathrm{SO}_3{ }^{2-}\\(b) \:\mathrm{HCN}$ and $\mathrm{SO}_3{ }^{2-}\\(c) \:HSO_3^-$ and $CN^-\\(d)\: \mathrm{CN^-}$ and $S0_3{ }^{2-}[/tex]
What are the important things about the periodic table?
The periodic table is a chart that arranges elements in a useful and logical manner. Elements are listed in order of increasing atomic number, lined up so elements that exhibit similar properties are arranged in similar rows or columns as others.
There is a total of about 94 elements on the periodic table that occur in nature. Remaining all of the other elements are strictly human-made. Some sources state most elements occur naturally because heavy elements may transition between elements as they undergo radioactive decay.
The First artificially made element was Technetium. Technetium is the lightest element that has only radioactive isotopes (none are stable).
The rows in the periodic table are called periods.
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what is the vapor pressure of an aqueous solution containing 9% (by weight) ethylene glycol (62 g/mol) at 25oc. ph2o
A solution of 9% (by weight) ethylene glycol (62 g/mol) in water at 25 °C has a vapor pressure of 23.1 torr.
Raoult's Law.
Consider a 100 g solution.
Ethylene glycol mass is 9 g
water mass is 100 g - 9 g = 91 g moles.
Ethylene glycol = 9 g times 1 mole/62 g =0.1451 moles.
moles water = 9 g x 1 mole/18 g = 5.0555 moles water
Total moles are equal to 0.1451 + 5.0555 = 5.2006 moles
the mole percentage of water = 5.0555 moles/5.2006 moles = 0.9720
Vapor pressure is equal to the mole percentage of water times the pure water vapor pressure (0.9720)(23.8 torr) = 23.1359 torr.
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a chemist mixes solid agcl, cucl2, and mgcl2 in enough water to give a final volume of 50.0 ml.
Because AgCl is insoluble in water. But Cu2Cl2, MgCl2 are soluble in water.
Silver chloride, AgCl, is a white crystalline solid with a poor water solubility. AgCl occurs naturally as the mineral chlorargyrite. When exposed to sunshine or heat, silver chloride oxidises to silver and chlorine.
AgCl has various disinfecting and antiseptic qualities and is also used to treat mercury toxicity. This substance is used in antimicrobials, wound healing products, personal deodorants, water treatment, and antidotes.
Ingestion, inhalation, and skin contact are all harmful. Prolonged exposure can cause argyria, a blue discoloration of the skin. Irritating to the eyes and skin. Dangerous to the environment.
Light sensitive compounds include silver chloride. They may also respond to light extremely quickly and lose their characteristics. As a result, they must be stored in dark bottles to prevent light from entering.
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express the equilibrium constant for the following reaction. 6na(s) + 6h2o(l) ⇋ 6naoh(aq) + 3h2(g)
The equilibrium constant for the given reaction is K = [H₂]³[NaOH]⁶
What is the formula for the equilibrium constant?The ratio of the concentration of the products raised to their coefficient to the ratio of the concentration of the reactants raised to their coefficients is how the equilibrium constant is defined, as we are aware.
However, specific reaction stages are not included in the formula for the equilibrium constant. These consist of:
Solid substances stable goodssolvent or liquid reactantsa liquid or a solventAdditionally, if the following are present in the reaction, the equilibrium constant expression must include them:
gases that reactGaseous goodsWater-based reactantsWater-based goods.The following equation can be used to calculate the equilibrium constant for the given reaction:
6Na(s) + 6H₂O(l)+⥂6NaOH (aq) + 3H₂(g)
Equilibrium constant, K = [H₂]³[NaOH]⁶
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which of the following is the correct order of boiling points for kno3, ch3oh, c2h6, ne?
Answer:
Ne < C2H6 < CH3OH < KNO3
Explanation: Boiling point is highest in Ne and least in KNO3
please explain why bulk polymerization are rarely adopted for large scale free radical polymerization?
Bulk polymerization is rarely adopted for large scale free radical polymerization because the process is not easily controlled
Bulk polymerization is an open system in which the reactants are not isolated from the surrounding environment, making it possible for external sources to influence the reaction conditions. In bulk polymerization, the entire mixture of monomers, initiator, and catalysts is placed in a single vessel and the reaction proceeds in a single, large-scale batch. This can lead to a number of problems, including uneven heat distribution, oxygen depletion, and uncontrolled reaction rates. Moreover, it is difficult to separate the desired product from the unreacted monomers and other byproducts, which can lead to product contamination. Additionally, bulk polymerization is usually limited to lower molecular weight poly This type of polymerization makes it difficult to maintain a constant monomer concentration and reaction temperature, both of which are crucial components in regulating free radical polymerization. In addition, bulk polymerization is more likely to produce byproducts that degrade the polymer's quality. All of these problems make bulk polymerization an ineffective and potentially hazardous choice for large-scale free radical polymerization.
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Benzoyl chloride, c6h5cocl, reacts with water to form benzoic acid, c6h5cooh, and hydrochloric acid. This first-order reaction is 25% complete after 26 s. How much longer would one have to wait in order to obtain 99% conversion of benzoyl chloride to benzoic acid?.
390 seconds are required for the conversion of benzoyl chloride to benzoic acid.
What is benzoyl chloride?Benzoyl chloride is also known as benzene carbonyl chloride. Benzoyl chloride has the chemical formula C7H5ClO. It is a colourless liquid with a boiling point of 198° and a strong odour in moist air.
It has a strong odour and causes excessive watering of the eyes and nose. It is practically insoluble in water.
Benzoyl chloride is used for the following purposes:
Tear gases containing benzoyl chloride are used to disperse mobs.Benzoyl chloride is primarily useful in the production of peroxides.It is also useful in the production of dyes, perfumes, pharmaceuticals, and resins.It's also used in photography and tanning.Learn more about Benzoyl chloride
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identify each of the following reactions as an isomerization, phosphorylation, or phosphate transfer.
how much energy is released (in kj) in the fusion reaction of 2h to yield 1 mol of 3he? the atomic mass of 2h is 2.0141 amu, and the atomic mass of 3he is 3.0160 amu.
Energy is released (in kj) in the fusion reaction of 2h to yield 1 mol of 3he is 3.204 × 10⁸ kJ / mol.
Calculation:-
2 ²₁ H -----> ³₂He + ¹₀n
mass 2.041 3.0160 1.008664
mass of product = 2 × 2.0141 = 4. 0282
mass of reactant = 3.0160 + 0.08664 = 4.02464
mass defect = mass of product - mass of reactant
= 4.0282 - 4. 2464
= 3.56 * 10⁻³ amu
= 3.56 * 10⁻³ amu × 1.66 × 10 ⁻²⁷ kg
= 5.9115 × 10⁻³⁰ kg
energy released = mc²
= 5.9115 × 10⁻³⁰ kg × (3 × 10⁸)²
= 5.32 * 10 ⁻¹³ J
conversion:-
5.32 * 10 ⁻¹³ J * 6.022 × 10²³ / 1 mol × 1 kj/10³ j
= 3.204 × 10⁸ kJ / mol
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a certain liquid has a normal freezing point of and a freezing point depression constant . calculate the freezing point of a solution made of of iron(iii) chloride () dissolved in
The differential between freezes point of the pure reagent and or the melting point of the solution is referred to as the depression in the freezing point.
How do melting and freezing points differ?
Definition. The temperature at which a liquid turns into a solid under normal air pressure is known as the freezing point. A melting point, on the other hand, is the temperature at which a solid turns into a liquid at ordinary atmospheric pressure.
Is the freezing point precisely 32 degrees?
Water frozen at 32 degrees Fahrenheit, 0 degrees Celsius, and 273.15 Kelvin, as we have all known. But this isn't always the case. After discovering water vapour at -40 degrees Centigrade inside clouds, scientists have even chilled water as in lab to -42 degrees C.
Briefing:
0.8 - (freezing point of solution)=4×7.82×81.1×1000/162.2×850
= 0.8-18.4
freezing point of solution = -17.6°C
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Ethanol is a possible fuel. Use average bond energies to calculate ΔHrxn for the combustion of ethanol.
CH3CH2OH(g) + 3O2(g) → 2CO2(g) + 3H2O(g)
If ethanol is a fuel option, the bond energies ΔHrxn are -1250 kJ/mol for ethanol combustion.
Can people consume ethanol?Over a billion individuals drink ethanol (also known as ethyl alcohol) nearly everyday. Yeast, sugars, plus starches are processed to create this kind of alcohol. People have been drinking ethanol-based beverages like beer and wine for generations to alter their mood.
Briefing:CH3CH2OH(g) + 3 O2(g) → 2 CO2(g) + 3 H2O
There are 5 C-H bonds, 1 C-O single bond, 1 O-H bond and, 3 O=O bonds and 1 C-C bond in reactants.
6 O-H bonds and 4 C=O bonds in products.
ΔHrxn = energy required to break reactant bonds - energy required to break product bonds.
ΔHrxn = [(5*411)+(1*358)+(1*459)+(3*494)+(1*346)]−[(6*459)+(4*799)]
ΔHrxn = 4700−5950
= -1250 kJ/mol
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