The negative sign indicators that the reaction is exothermic. the enthalpy change -2257.2 J.
Describe enthalpy.Enthalpy, one of a thermodynamic system's attributes, is determined by multiplying the system's internal energy by the sum of its pressure and volume. The large surrounding environment conveniently offers this state function, which is commonly utilized in measurements of chemical, biological, and physical systems at constant pressure.
In order to calculate the system's physical dimensions, the pressure-volume term specifies the effort required to displace the system's surrounds and make room for it. The pressure-volume term is quite tiny for solids and liquids under ordinary conditions, but only fairly modest for gases. Enthalpy therefore acts as a substitute for energy in chemical systems.
The equation for the reaction is NaOH + HCl [tex]\rightarrow[/tex] NaCl + H₂O
Volume of the solution (100+100) ml = 200ml
Mass of solution = 200ml soln. x 1.00gm/1ml soln. (water density 1g/ml)
= 200ml
We, know the rule q=mcp∆t can be used to calculate the enthalpy change
Where q = enthalpy change
m = mass of solution
c = Specific heat of solution
∆t = Change in temperature
∴ m = 200gm soln.
c = 4.18J/g°C (water specific heat)
∆t = (27.2°C - 24.5°C)
∴ q=mcp∆t
= 200gm x 4.18J/g°C x (27.2°C - 24.5°C)
= 2257.2 J
We known that
q reaction = - q solution
= (c x m x ∆t) soltuion
∴ q reaction = -2257.2 J
Therefore, the correct answer is -2257.2 J
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Upon combustion, a 0.8009 g
g
sample of a compound containing only carbon, hydrogen, and oxygen produces 1.6004 g
g
CO2
C
O
2
and 0.6551 g
g
H2O
H
2
O
. Find the empirical formula of the compound.
The empirical formula of the compound is mathematically given as
C2H4O
This is further explained below.
What is the empirical formula?Generally, The empirical formula of a chemical compound is the most straightforward representation of the atom counts in the molecule as whole numbers.
As a straightforward illustration of this idea, consider the empirical formula of sulfur monoxide, which is denoted by the symbol SO, and compare it to the empirical formula of disulfur dioxide, which is denoted by the symbol S2O2.
moles of CO_2=[tex]\frac{ 1.6004 }{44.01}[/tex]
moles of CO_2= 0.0364 moles
moles of H_2O=[tex]\frac{0.6551}{ 18.01 }[/tex]
moles of CO_2= 0.0364 moles
It takes 0.0364 moles of carbon to make up 1 mole of carbon dioxide.
1 mole of H2O contains 2 moles of hydrogen, which is equal to 2 times 0.0364, or 0.0728 moles of hydrogen.
C & H = 0.0364 x 12.01
C & H= 0.437 g C
0.0728 x 1.008 = 0.0734 gH
Mass O = 0.8009 -(0.437 + 0.0734)
Mass O= 0.2905 g
O moles=[tex]\frac{0.2905}{16}[/tex]
O moles= 0.0182 moles
C = [tex]\frac{0.0364}{ 0.0182}[/tex]
C= 2
H =[tex]\frac{0.0728}{ 0.0182}[/tex]
H = 4
O =[tex]\frac{0.0182}{ 0.0182 }[/tex]
O= 1
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The combustion of propane may be described by the chemical equation
C₂H₂(g) +50₂(g) → 3 CO₂(g) + 4H₂O(g)
How many grams of O₂(g) are needed to completely burn 27.6 g C₂H, (g)?
137.6 grams of oxygen are needed to completely burn 27.6 grams of C₂H₂ during the combustion of propane in the equation.
What is combustion?Combustion is the reaction of a substance with oxygen with a deliberate amount of heat and light release.There are several kinds of combustion rapid combustion, spontaneous combustion, and Explosive also.The molar mass of C₂H₂ = 32 g
Molar mass of oxygen = 32 g
Therefore, the moles of propane is given as
27.6/ 32
=0.86 moles
Usually 1 equivalent of C₂H₂ will consume 5 equivalent of oxygen. So, 0.86 moles will consume
0.86 × 5
= 4.3
So, moles of oxygen will be
4.3 × 32
= 137.6 g
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0.8058 g of an unknown gas at 298.15 K and 1.000 bar of pressure fills a 500.0 mL flask. What is the molar mass of the gas?
According to the given statement the molar mass of the gas is 39.400 g/mole.
How is the molar mass calculated?The mass in grams of one mole of a substance is its molar mass. The molar mass of a substance can be determined by adding the molar masses of its component atoms, as shown in this video. The computed molar mass can then be used to convert the mass and the number of molecules of the substance..
Briefing:From ideal gas equation we know, PV = nRT
PV =w/M * RT
n is number of moles = w/M,
we = weight of gas,
M = molecular weight of the gas
PV = wRT/M
Value of pressure, P = 1atm and standard temperature, T = 298.15K
Value of universal gas constant,
R = 0.082 lit. atm. K⁻¹.mol⁻¹
Weight of gas,
w = 0.8058g and volume of gas,
V = 500mL = 0.5 Liters
Substituting all the value, we get :
Molar mass = 0.8058* 0.082 * 298.15 / 1 * 0.5
Molar mass = 39.400 g/mole
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Give the formula for dicarbon tribromide. Since there is no way to subscript, use regular numbers in place of subscript (for example, Al2O3). Be sure to use parenthesis only when needed and proper upper and lower case.
Question 6 options:
The correct formula of the dicarbon tribromide molecule is shown as [tex]C_{2} Br_{3}[/tex].
What is the chemical formula?The chemical formula is the representation of a compound on paper. It is the way by means we are able show the way that atoms of a compound are connected to each other. We often use this method to show the representation of a compound in way that is somewhat intelligible to someone who needs to understand it.
We are now going to try to see how we could be able to find the correct formula of the compound knowing all the subscripts required in the process.
Now, most importantly, the formula must show the number of atoms of each of the elements that are in the compound. Looking at what we have, we are asked to find the formula of the compound dicarbon tribromide. We already know that there would be two atoms of carbon and three atoms of bromine in the compound.
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Determine the quantity in moles of RbF that are in 57.0 grams of RbF.
The quantity of moles in 57.0grams of RbF is 0.545mol.
How to calculate number of moles?Moles is the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.022 × 10²³ elementary entities (atoms, ions, molecules, etc.).
The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
No of moles = mass ÷ molar mass
Molar mass of RbF = 85.467 + 18.998 = 104.5g/mol
moles = 57.0g ÷ 104.5g/mol = 0.545mol
Therefore, 0.545moles is the quantity of moles of RbF in 57.0grams of the compound.
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why do liquids retain their volume under pressure
The volume of a liquid is not substantially affected by variations in pressure. Any pressure increase can only slightly shorten the distance between the densely packed molecules, liquids are incompressible.
How does pressure change in liquids?Increased pressure occurs as depth increases. The pressure in a liquid is influenced by the mass of the surrounding water above. Due to the near proximity of the molecules in a liquid, pressure exerts itself in all directions.
How do you explain pressure?"Pressure" is described as the thrust (force) applied to a surface per area. The force to effective area is another way to describe it (over which the force is acting).
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6) krite the molecular equations for the
dissociation of the following in water.
a) Na₂S b) A/Cl₂ c) HBr a Pb(NO3)₂
The formula on the left, which consists of two sodium ions and one sulfide ion, is the equation for the dissociation of sodium sulfide in water. The ions split from one another as the chemical dissociates in water. On the right side of the equation, there are 2 Na+ ions and 1 S2- ion.
Na2S(s) ---> 2Na+(aq) + S2- (aq)
Being a strong acid, hydrogen bromide, or HBr, has the equation HBr(aq) -> H+(aq) + Br- for its dissociation (aq). The equation for hydrogen flouride, or HF, is HF(aq) -> H+(aq) + F- because it creates a weak acid (aq). Weak acids create equilibrium, which is why the two-way arrow is there!
The hydrogen bromide ionizes and dissolves in water as follows:
H3O+(aq) + Br- = HBr(g) + H2O(l) (aq)
A soluble ionic molecule called lead(II) nitrate, Pb(NO3)2, completely dissociates in water to produce lead(II) cations, Pb2+, and nitrate anions, NO3. Hydrogen sulfide, H2S, is bubbled through the solution in order to precipitate the lead(II) cations.
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Elements with electron configurations that end in p6 belong to which group?
noble gases
halogens
alkali metals
transition metals
Answer:
im pretty sure its transition metals
Explanation:
Plsss I need it urgently
From the particles shown, the ones that will have a stronger attraction to each other are those in water H₂O. This is because water has a boiling point of 100°C while that of CO₂ is -78.5. Hence, while both are covalently bonded, the bonds in water are stronger.
What is a Covalent Bond?It is to be noted that a covalent bond is formed between two atoms by the mutual use of one or more pairs of electrons. The two atomic nuclei attract these electrons at the same time. When the difference in electronegativities of two atoms is too tiny for electron transfer to produce ions, a covalent bond occurs.
The word "covalent bond" first appeared in 1939. The prefix co- denotes jointly, related in action, paired to a lesser degree, etc.; hence, a "co-valent bond" in essence indicates that the atoms share "valence," as defined in valence bond theory.
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What is the difference between structure and function in plants and animal cell organelles
Answer:
cell wall
Explanation:
plant cell have cell wall and can go through the process of plasmolysis.
they also contain stoma
animal cell are smaller
What happens when a solute dissolves in water?
Answer:
Dissociate
When a solute dissolves in water, a solution is formed.
What is a solute?A solute is any substance capable of dissolving in a solvent in order to form a solution.
When a solute dissolves in a particular solvent, it is said to be that solvent-soluble. Otherwise, it is insoluble.
Now, when the solvent in question is water, the substance is said to be water-soluble or water-insoluble as the case may be.
If a solute is water-soluble, then it forms a solution. If the solute is ionic, it does not just form a solution, it dissociates into its component ions in the solution.
If the solute is not ionic, no dissociation occurs in the solution.
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. What is the molar mass of sulfuric acid, (H2SO4), a substance frequently used to commit horrific violent crimes against women? Show your work.
Which of the following statements does not describe the structure of an atom? The electron cloud is a small and compacted space around the nucleus? The electron cloud is a small and compacted space around the nucleus? Protons are positively charged sub-atomic particles? Or Electrons are negatively charged subatomic particles?
Atoms are made up of protons and neutrons in the center, with electrons circling in orbitals outside the nucleus.
As a result, option c is the right answer.
What is an atom's structure?A complicated collection of electrons with negative charges grouped in specified shells around a positive-charged nucleus is an atom. This nucleus, which is made up of protons and neutrons, holds the majority of the atom's mass (except for common hydrogen which has only one proton). Every atom is nearly the same size.
The electron is a specific location where an electrons is most likely to be found. We can't see where an electrons is, but we can utilize its wave equation to calculate the likelihood that it is in a specific place.
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hexane has a density of 0.659 g/ ml. How many milliliters (mL) would a student need to pour in order to get 49.5 g if he hexane?
Answer:
75.114ml
Explanation:
volume = mass÷ density
Fe(OH)2(s) + O2(g) +OH-Fe(OH)3(s) + H2O balance in basic solution
Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O balance in basic solution is 4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)
A basic solution is an aqueous solution containing more OH⁻ ions than H⁺ ion
The unbalanced redox equation is as follows:
Fe(OH)₂(s) + O₂(g) +OH → Fe(OH)₃(s) + H₂O
In the chemical reaction all atoms other than hydrogen and oxygen are balanced and the oxidation number of fe changes from 2 to 3 and the change in the oxidation number is 1 and the oxidation number of fe changes from 0 to -2 and for 2O atoms the change in the oxidation number is 4 and then balance the equation with increase in the oxidation number and with decrease in the oxidation number
Fe(OH)₂(s) and Fe(OH)₃(s) with 4 then,
4Fe(OH)₂(s)+O₂(g) → 4Fe(OH)₃(s)
To balance O atoms, add 2 water molecules on LHS,
4Fe(OH)₂ (s) + O₂(g) + 2H₂O → 4Fe(OH)₃(s)
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What are the wastes product from cellular respiration
Which type of chemical reaction is condensation?
Match the words in the left column to the appropriate blanks in the sentences on the right.
Condensation is a chemical reaction of synthesis. It represents two organic molecules producing one organic molecule and a water molecule.
What are condensation reactions?Condensation reactions are reactions in which two or more substances combine together chemically to produce a larger molecule with the elimination of a small molecule such as water, ammonia, or HCl.
Condensation reactions are important reactions in the formation of polymers.
Polymers are large organic molecules that are composed of smaller repeating units known as monomers.
An example of a condensation reaction is the reaction in which two amino acids are linked together by a peptide bond to form a dipeptide. A water molecule is also eliminated.
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Based on the diagram, describe the relationship between the deer population and biodiversity in forest c
Not adversely but deer population do effects the biodiversity in a way that plant diversity specifically get reduced.
What is biodiversity and how deer population effects the biodiversity?Biodiversity refers to the population of all plants and animals living on the earth along with other species.Now deer population is a bane and a boon both to the natural ecosystem, to the diverse unification of species on Earth.Deer in the forest eat the plants that tastes good and leave the ones that do not , even if it is the product or leaves of the same plants.This led to trouble in colonial growth of plants again , which reduces plants in that area.And deer population in every possible forest suffers this issue and collectively it accounts for a big biodiversity reduction.To know more about biodiversity visit:
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X If I want to measure the mass of a fly in metrics, What should I use
If want to measure the mass of a fly in metrics use a scale or a balance.
What is the most used metric system?The current international standard metric system and the one that is most generally used worldwide is the International System of Units (Système international d'unités, or SI). It is a development of Giorgi's MKSA system, with the meter, kilogram, second, ampere, kelvin, candela, and mole as its fundamental units.
What tool should you use to measure mass?A balance is used to estimate an object's mass for the majority of commonplace objects. The balance compares the target object to a known mass object. Digital scientific balances and beam balances, like a triple beam balance, are examples of several sorts of balances.
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Which substances have the same empirical formula?
Sample Formula
1 CH3OH
2 CH2O
3 C6H12O6
4 C2H4O2
5 C7H5O2
6 C8H8
a. Samples 1 and 3
b. Samples 1, 2, and 4
c. Sample 1 and 4
d. Samples 2, 3, and 4
The atomic number of an element gives several pieces of information including:Choose all that apply [] the elements color [] the number of protons [] the number of electrons [] the elements position on the periodic table
Atomic numbers are the numbers possessed by an element in a periodic table. These numbers are used to identify an element and their position in the periodic table.
The atomic number of an element is equal to its proton and electron number but not its neutron
Hence we can conclude that the correct information about the atomic number of an element includes:
• The number of protons
• The element position on the periodic table
The Rf value is used to produce a final confirmation of the identify of a substance.
True or False
The Rf value is used to produce a final confirmation of the identify of a substance its true sentence
In thin-layer chromatography, the retention factor Rf is used to compare and help identify compounds and the Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front both measured from the origin and Rf values are used to determine polarity, relative masses, and relative solubility's, among other things
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High temperatures can lead to the melting of metamorphic rock and the formation of _____.
The metamorphic rock on high temperatures could melt and result in the formation of Igneous rock
New rock formation happens when there is an increase in temperature or pressure or in some cases both.
On either high temperature or high pressure, the metamorphic rock would melt. The melting of metamorphic rock would result in magma. This magma on cooling solidifies and forms Igneous rock. It is crystalline/glassy in nature.
On the other hand, if igneous rock melts under high pressure or temperature, it would revert back to metamorphic rock.
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In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Answer
(A) H3PO4
(B) H₂SO4
(C) HCIO3
(D) H₂O
Answer:
B is the answer
Explanation:
H2SO4 contains:
2H
1S
4O
4 is double of 2
Write the balanced NET ionic equation for the reaction when (NH4)2CO3 and CaCl2 are mixed in aqueous solution.
The balanced NET ionic equation for the reaction when (NH₄)₂CO₃ and CaCl₂ are mixed in aqueous solution.
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
The reaction is :
(NH₄)₂CO₃ + CaCl₂ -----> NH₄Cl + CaCO₃
1) the balanced molecular eqaution :
(NH₄)₂CO₃(aq) + CaCl₂(aq) -----> 2NH₄Cl(aq) + CaCO₃(s)
2) split strong electrolytes into ions : complete ionic equation
2NH₄⁺ + CO₃²⁻ + Ca²⁺ + 2Cl⁻ -----> 2NH₄⁺ + 2Cl⁻ + CaCO₃
3) eliminate the spectator ions on both sides of ionic equation:
CO₃²⁻(aq) + Ca²⁺(aq) ---> CaCO₃(s)
4) The net ionic equation is :
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
Thus, The balanced NET ionic equation for the reaction when (NH₄)₂CO₃ and CaCl₂ are mixed in aqueous solution.
Ca²⁺(aq) + CO₃²⁻(aq) ---> CaCO₃(s)
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Using the information given, write the isotopic symbol:
Z= 42
A= 98
Gained one electron
Let us take the isotope as E then Z is its atomic number and A is the mass number. Thus, if Z = 42 and A = 98 then the isotope can be seen as [tex]^{98}_{42}E[/tex].
How are the electrons in an isotope symbol located?Add the antithesis of the charge imbalance to the number of protons to determine the number of electrons.
For instance, a phosphorus isotope with an atomic number of 15 has a -3 charge, meaning that there are three more electrons than protons in that isotope.
How should an isotopic sign be written?The atomic number should be written as a subscript and the mass number (protons + neutrons) should be written as a superscript to the left of the atomic symbol when writing the symbol for an isotope.
Notation for IsotopesStandard, or “AZE,” notation can also be used to describe isotopes, where A stands for the mass number, Z for the atomic number, and E for the element symbol. To the left of the chemical symbol “E,” a superscript denotes the mass number “A,” and a subscript denotes the atomic number “Z.”
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Where are non metals located in the periodic table?
Answer: Right Side
Explanation: The nonmetals or non-metals are a group of elements located on the right side of the periodic table (except for hydrogen, which is on the top left).
Answer: non-metals are on the right side of the periodic table. They are located to the right of the line (usually appears as a dark latter). Note that hydrogen is not located there but it is also a non-metal.
You are running a genetics experiment. Which of the following will help you obtain the copies of the gene you need?
A. Plasmid
B. Ribosome
C. Nucleus
D. Mesosome
Plasmids help you obtain the copies of the gene you need.
What are plasmids?In contrast to a cell's chromosomal DNA, plasmids are tiny, circular, double-stranded DNA molecules.Plasmids, which are found in a wide range of microorganisms, most notably bacteria, are small, extra-chromosomal circular DNA molecules that can replicate on their own without the assistance of the host.Plasmids naturally exist in bacterial cells and certain eukaryotes as well.Plasmid genes frequently give bacteria genetic advantages, such as antibiotic resistance.Bacteria and certain other tiny creatures have little, circular DNA molecules called plasmids.Chromosomal DNA is physically distinct from plasmids, which multiply autonomously.To learn more about plasmids, refer
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22.5g of potassium carbonate is dissolved in water and then mixed with excess aluminum nitrate. How many moles of dried precipitate should be formed?
Explanations
[tex]3K_2CO_3(aq)+2Al_2\operatorname{\lparen}NO_3)_3+3H_2O\rightarrow2Al(OH)_3+3CO_2+6KNO_3[/tex]Given the following
Mass of potassium carbonate = 22.5grams
Determine the moles of potassium carbonate
Moles of potassium carbonate = mass/molar mass
22.5/138.205|
= 0.1628moles
Since the precipitate formed is aluminum hydroxide, hence the mole of precipitate formed if 3moles off K2CO3 produce 2moles of Al(OH)3 is given as:
[tex]\begin{gathered} mole\text{ of Al\lparen OH\rparen}_3=\frac{2}{3}\times0.1628 \\ mole\text{ of Al\lparen OH\rparen}_3=0.1085moles \end{gathered}[/tex]Hence the moles of dried precipitate should be formed
how many grams of silver iodide, AgI, are produced from 43.3 g of calcium iodide, CaI2?
Taking into account the reaction stoichiometry, 121.89 grams of AgI are produced from 43.3 g of calcium iodide.
Reaction stoichiometryIn first place, the balanced reaction is:
CaI₂ + 2 AgNO₃ → 2 AgI + Ca(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaI₂: 1 moleAgNO₃: 2 molesAgI: 2 molesCa(NO₃)₂: 1 moleThe molar mass of the compounds is:
CaI₂: 166.9 g/moleAgNO₃: 169.87 g/moleAgI: 234.77 g/moleCa(NO₃)₂: 164 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
CaI₂: 1 mole ×166.9 g/mole= 166.8 gramsAgNO₃: 2 moles ×169.87 g/mole= 339.74 gramsAgI: 2 moles ×234.77 g/mole= 469.54 gramsCa(NO₃)₂: 1 mole ×164 g/mole= 164 gramsMass of AgI formedThe following rule of three can be applied: if by reaction stoichiometry 166.8 grams of CaI₂ form 469.54 grams of AgI, 43.3 grams of CaI₂ form how much mass of AgI?
mass of AgI= (43.3 grams of CaI₂×469.54 grams of AgI)÷ 166.8 grams of CaI₂
mass of AgI= 121.89 grams
Finally, 43.3 grams of CaI₂ form 121.89 grams of AgI.
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