From the reaction, the volume of the oxygen required is 89.6 L.
What is stoichiometry?The term stoichiometry has to do with the process by which the mass of reactants or products in a reaction is obtained from the balanced reaction equation.
In this case, the balanced reaction is equation is;
CH₄ + 2 O₂ → CO₂ + 2 H₂O
Number of moles of CO2 = 88.0 g/44 g/mol = 2 moles
2 moles of O2 produced 1 mole of CO2
x moles of O2 produces 2 moles of CO2
X = 4 moles
1 mole of oxygen occupies 22.4 L hence 4 moles of oxygen occupies 4 * 22.4 L = 89.6 L
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After spraying water on a waxed surface, a student notices that the water beads up to form many individual drops rather than being spread out evenly across the surface. what property of water causes it to bead up like this?
Property of water:
Due to the water's ability to stick together (Cohesion), droplets form instead of being spread evenly.
The strong cohesion between water molecules:
Cohesion is defined as the firm attraction between molecules of the same type.This characteristic of water is due to hydrogen. Water molecules are maintained intact by the strong connections that hydrogen forms with one another. Since hydrogen bonds are more attracted to one another than to the wax surface, they tend to bead when sprayed on it.Additionally, the surface tension of water is very strong. This indicates that the molecules on the water's surface are not being drawn in by other molecules in the water's interior due to comparable molecules surrounding them on all sides. These molecules tightly attach to one another while only slightly adhering to the other medium. These water drops are rounded due to surface tension, which allows them to cover the least amount of surface area.Learn more about cohesion here:
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What is the molarity of a solution prepared by dissolving 12.0 g of sodium hydrogen carbonate, NaHCO3, in
water to make 250.0 mL of solution?
Answer:
- 0.57138096 M
- 0.571mol
- 0.571 M NaHCO3
- 0.571 mol/NaHCO3
(these are just different ways to identify the units but they all work and mean the same thing)
Explanation:
- molarity is measured by the ratio of the moles of a solute per liters of a solution
- the formula for molarity is: [tex]M = \frac{mol (s) solute}{L solution}[/tex]__________________________________________________________
- first, you need to convert 250mL to L so, [tex]250/1000=0.25[/tex]
- when it comes to converting g to mol you can do it in a separate equation but i prefer to do it all in one equation
__________________________________________________________
- so the equation for this specific problem would be set up like this:[tex]\frac{12.0g}{.25L} x \frac{1mol}{84.007 g} = x[/tex]
12.0g of NaHCO3.25 L of solution1 mol: 84.007g (the molar mass of NAHCO3)__________________________________________________________
- now to actually solve it:
[tex]\frac{12.0g}{.25L} x \frac{1mol}{84.007 g} = \frac{12.0}{21.00175} = 0.57138096(or)/0.571mol/0.571 M NaHCO3/(0.571 mol/NaHCO3)[/tex]
you just multiply across so [tex]12x1=12[/tex] and [tex].25x84.007 = 21.00175[/tex] then divide so [tex]12.0/21.00175 = 0.57138096[/tex]hope this helps :)
A 20.0 g sample of methyl alcohol (CH3OH, molar mass 32.0 g/mol) was dissolved in 21.6 g of water. The mole fraction of CH3OH is:
A 20.0 g sample of methyl alcohol (CH₃OH, molar mass 32.0 g/mol) was dissolved in 21.6 g of water. The mole fraction of CH₃OH is 0.342.
How to find the number of moles ?Number of moles = [tex]\frac{\text{Given Mass}}{\text{Molar Mass}}[/tex]
Number of moles of CH₃OH = [tex]\frac{20\ g}{32\ g/mol}[/tex]
= 0.625 mol
Number of moles of H₂O = [tex]\frac{21.6\ g}{18\ g/mol}}[/tex]
= 1.2 mol
How to find the Mole fraction ?Mole Fraction = [tex]\frac{\text{Moles of solute}}{\text{Moles of solute + Moles of solvent}}[/tex]
= [tex]\frac{0.625}{0.625 + 1.2}[/tex]
= [tex]\frac{0.625}{1.825}[/tex]
= 0.342
Thus from the above conclusion we can say that A 20.0 g sample of methyl alcohol (CH₃OH, molar mass 32.0 g/mol) was dissolved in 21.6 g of water. The mole fraction of CH₃OH is 0.342.
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Sulfur hexafluoride, SF6, is Multiple Choice a reactive gas that decomposes when exposed to moisture. a reactive gas used to fluorinate organic compounds. an inert gas that is used as an electrical insulator. a reactant in the process of manufacturing non-stick coatings. used in the manufacture of sulfuric acid.
An inert gas is used as an electrical insulator.
What exactly is SF6 (sulfur hexafluoride)?Sulfur hexafluoride (SF 6)) is a very potent and long-lasting greenhouse gas that is primarily used as an electrical insulator and arc suppressor. It is non-flammable, non-toxic, inorganic, colorless, and odorless.
What is the SF6's reactivity?The sulfur atom's steric hindrance plays a significant role in the inertness of SF6, whereas SeF 6 and other heavieSFroup 16 equivalents are more reactive than SF 6 due to less steric hindrance.
However, it reacts exothermically with lithium and does not interact with molten sodium below its boiling point.
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Perform an online search to find the structures of the compounds in the questions that follow. Provide a method for separating the mixtures of two or three compounds, dissolved in a solvent diethyl ether. In each case one of the components will be a neutral compound. You should give your answer in the form of a flow chart.
a) Benzophenone and tributylamine
b) 4-Bromoaniline, 3-nitrobenzoic acid, and benzoin
c) Fluorenone, octanoic acid, and dicyclohexylamine
d) 1-Hexanol and 4-bromoaniline
The chemical separation method for two of the above named mixtures or compound indicated above are explained below.
What is a Chemical compound?A chemical compound is a material generated by the chemical union of two or more elements in set quantities.
What are the separation methods?Benzophenone and tributylamine
The combination of benzophenone and tributylamine is in diethyl ether (given in question). Tributylamine is a base that may readily be changed to a water soluble salt by adding an aqueous acid.
Add dilute aqueous acid to the solution. The amine salt will be present in the aqueous layer, whereas benzophenone will be present in the ether layer. A separatory funnel will isolate levels.
Fluorenone, octanoic acid, and dicyclohexylamine
Fluorenone, Octanoic acid, and dicyclohexyl amine: The combination comprises both an acid (octanoic acid) and a base (dicyclohexyl amine) (dicyclohexyl amine).
Add the diluted aqueous base to the solution (like NaCO3). Divide the two layers.
The acid is present in the aqueous layer as a salt, while the fluorenone and amine are present in the ether layer.
Add weak aqueous acid to this combination of fluorenone and dicyclohexyl amine.
Divide the two layers. The amine is present in the aqueous layer, and fluorenone is present in the ether.
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1.When an electron jumps to an outer energy level it
a. Absorbs energy
b. Maintains constant energy
c. Loses energy
d. Gain and lose energy
2.A chemical property is demonstrated by
a. Hailstone forming inside a storm cloud
b. Lime water turn in Milky When carbon dioxide Is blown into it
c. Clothes drying on an outdoor line in the bright sunshine
d. Ice floating on the surface of a lake in winter
3. Which of the following properties of magnesium is qualitative physical property
a. Reacts slowly with oxygen at 22°C to produce magnesium oxide
b. Has melting point of 649°C
c.Has a bright silvery colour in the metallic form when freshly made
d. Develops a thin oxide that coating when left exposed
Answer:
1:loses or gains energy
A woman walks into a carpet store wearing high-heeled shoes with a circular heel of diameter 0.987 cm. To the dismay of the store manager, she balances on one heel on an expensive carpet sample. If she has a mass of 45.5 kg, determine the pressure she exerts on the carpet sample.
The pressure she exerts on the carpet sample:-5.8279 MPa
Calculation of Pressure exerted on the carpet:-P = F/A
Where,
F= Force
A = Area
Given that;
d= 0.987 cm =0.987 x 10^-2 m
m= 45.5 kg
Area = πr^2= (π(0.987 x 10^-2)^2/2)
=7.6511 x 10^-5 square meter
Force= mg
= 45.5 x 9.8
=445.9 N
Pressure = force/ area
=445.9/7.6511 x 10^-5
=5.8279 MPa
The pressure she exerts on the carpet sample:-5.8279 MPa
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Cooperative binding to oxygen occurs for ________
Cooperative binding of oxygen occurs for hemoglobin.
What is cooperative binding of system?Cooperative binding refers to the process whereby binding of one molecule of oxygen results in more binding of oxygen molecules due to increased affinity of oxygen by the ligand.
Cooperative binding of oxygen occurs in hemoglobin.
In conclusion, cooperative binding enables hemoglobin to carry oxygen efficiently.
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The atmospheric pressure on mars is around 7 millibar, where the gravitational constant
is 3.7 m/s² instead of Earth's 9.8 m/s². What height of water column would be stable on
Mars? Assume a density of water of 1.0g/mL.
The height of water column would be stable on Mars is 1.89 m
To answer the question, we need to know what the pressure on mars is
What is the pressure on mars?The pressure on mars P = ρgh where
ρ = density of water = 1.0 g/mL = 1.0 × 10⁻³ kg/1 × 10⁻³ L = 1 kg/L = 1 kg/1 × 10⁻³ m³ = 1000 kg/m³, g = acceleration due to gravity on mars = 3.7 m/s² and h = height of water column.Height of water columnMaking h subject of the formula, we have
h = P/ρg
Since
P = 7 mbar = 7 × 10⁻³ bar = 7 × 10⁻³ × 10⁵ Pa = 700 Pa,ρ = 1000 kg/m³ and g = 3.7 m/s²Substituting the values of the variables into the equation, we have
h = P/ρg
h = 700 Pa/(1000 kg/m³ × 3.7 m/s²)
h = 700 Pa/370 kg/m²s²
h = 1.89 m
So, the height of water column would be stable on Mars is 1.89 m
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What coefficient must be added to the carbon in the reactants to balance the following equation?
Na2CO3 (l) + C (s) → 2 Na (g) + 3 CO (g)
A. 5
B. 4
C. 3
D. 2
Answer:
2
Explanation:
There are 3 carbons on the right side
there are only two on the left side....you need one more ...so add one more... change the '1' coefficient in front of C to '2'
Guanine pairs with cytosine using ______ noncovalent hydrogen bonds, while adenine pairs with thymidine using ______ noncovalent hydrogen bonds. Multiple choice question. two; two
Guanine pairs with cytosine using three noncovalent hydrogen bonds, while adenine pairs with thymidine using two noncovalent hydrogen bonds.
Why does cytosine and guanine have 3 hydrogen bonds?Cytosine and guanine are joined by three hydrogen bonds. The Watson and Crick bases differ from one another in strength as a result. Thymine and adenine bonded base pairs in DNA are weaker than guanine and cytosine bonded base pairs. Size and structure of the specific nucleotides cause Adenine and Thymine to always pair together while Cytosine and Guanine always pair together.
Adenine and thymine can make two hydrogen bonds, while cytosine and guanine can form three hydrogen bonds. Or, to put it more simply, A and G form bonds. Because each base can only link with one other base, the process is known as complementary base pairing.
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Environmental Effects Summary
Explain how the data from the river samples showed that there was a problem with the water treatment plant.
River samples may evidence problems with the water treatment plant because it may contain an excessive amount of certain substances which are filtered during this procedure.
What is a water treatment plant?A water treatment plant is a place where wastewater from a city is processed and purified in order to obtain potable water.
Water treatment procedure generally involves the collection, chemical substance addition, filtration, and disinfection.
Any type of problem in these steps can be evidenced by taking a sample of the water after treatment.
In conclusion, river samples evidence problems due to an excessive amount of certain substances which are filtered during this procedure.
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what made alchemy unscientific in its practices
The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.
Alchemy is an old practice that might be thought of as a forerunner of chemistry.
The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold
The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.
To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.
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Which is an issue that governments must consider before passing conservation policies?
Issues that should be taken into account:
"Urbanization implications" are the issues that governments must consider before passing conservation policies.
Conservation policies:
It is a policy intended to preserve or restore a community, ecosystem, endangered species, or a natural or semi-natural environment.
Protecting the planet's natural resources for the benefit of present and future generations is known as conservation.
Urbanizations implications:
Deforestation, habitat loss, and freshwater extraction are all frequent effects of urbanization, which can reduce biodiversity and change the ranges and interactions of various species.Overall, urbanization resulted in reductions of 2.6% carbon sequestration, 1.1% natural habitat, 6% soil conservation, and 3.4 % water retention. Compared to other types of environmental loss, urbanization has a longer-lasting effect. Thus the government must consider this issue while passing conservation policies.Learn more about the urbanizations implications here,
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A radioactive substance has a half-life of 5 million years. What is the age of a rock in which 25% of the original radioactive atoms remain? You must show your work or explain how you came up with your answer for full credit.
Answer:
10 million years
Explanation:
For a sample to decay to 25% of its original amount, 2 half lives must have passed. Since one half life is 5 million years, multiplying this by 2 gives us that 2 half lives is 10 million years.
Describing nuclear fission and fusion which applies to fusion? check all that apply. involves the splitting of nuclei takes place in the sun releases radiation as a waste product occurs in nuclear power plants and is used to generate electricity plays a role in the production of essentially all elements heavier than helium releases large amounts of energy
Which holds true for nuclear fission? Check all that apply.
Involves the splitting of nucleiReleases large amount of energyReleases radiation as a waste productOccurs in nuclear power plants and is used to generate electricityWhich holds true for nuclear fusion? Check all that apply.
Takes place in the sunPlays a key role in the production of essentially all elements heavier than heliumReleases large amounts of energyWhat is nuclear fission?
An unstable nucleus splitting into two smaller, more stable nuclei is known as nuclear fission. Large amounts of energy are released during this process since a smaller nucleus's structure requires a lot less energy to maintain. This mechanism is exploited by turning the thermal energy released into electrical energy.
What is nuclear fusion?
The alternative is nuclear fusion. It entails joining two smaller, less stable nuclei into one larger, more stable nucleus. The sun is where this process takes place because it needs so much energy. Moreover, a tremendous amount of energy is released. Helium, a two-proton element, is the smallest element that can be created using this procedure. The smallest element has one proton (H).
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Answer:
A B D E
Explanation:
Edge 2023
4. Which of the following methods of preserving food keeps food for long without going bad by making bacteria inactive? A. Freezing and deep frying B. Canning and salting C. Charcoal cooler and freezing D. Drying and carbon dioxide 4 . Which of the following methods of preserving food keeps food for long without going bad by making bacteria inactive ? A. Freezing and deep frying B. Canning and salting C. Charcoal cooler and freezing D. Drying and carbon dioxide
Answer:
c. because it lacks oxygen which might support life of the bacteria
In a filtration experiment 25cm of a solution of a sodium hydroxide contain 8g per litre was required for complete neutralization of 0.245g of a diabasic acid. Calculate the relative molecular mass of the acid (Na= 23, O=16,H=1)
The relative molecular mass of an element is a proportion of the mass of the unified amu. The relative molecular mass of sodium hydroxide is 40.
What is molecular mass?The molecular mass of a substance is an addition of the individual masses of the element that makes the compound.
Moles of NaOH = 8 mole
Molarity = 0.2 M
Moles of sodium hydroxide in 25 cm³: 25 × 0.2 = 0.005 moles
The mole ratio between the two moles:
0.2 ÷ 0.005 = 40
Therefore, 40 is the relative molecular mass of the acid.
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How many colvant bonds can a typical carbon atom form
[tex]\huge\purple{Hi!}[/tex]
carbon atom can form four covalent bonds.
The measurement of Uric acid in 24-hour urine samples requires a specific sample collection procedure, part of which is the refrigeration of the sample. Refrigeration will:
Refrigeration will prevent bacterial growth which may result in uricase production and breakdown of uric acid in the sample.
What is uricase ?
An enzyme called uricase is responsible for catalyzing the change of uric acid into allantoin. Your body excretes uric acid, an acidic waste product, through urine. It is a typical result of the digestion of purine-rich meals.
Only media containing uric acid, allantoin, or allantoate as the primary or only source of carbon, nitrogen, and energy support the growth of the bacteria Bacillus fastidious. Raw extract of cells cultivated on uric acid had significant amounts of uricase.
Alcaligenes eutrophus, Pseudomonas aeruginosa, and Micrococcus denitrificans all displayed increased uricase activity after being placed in conditions containing uric acid, according to Kaltwasser. The ability of microorganisms to degrade uric acid and to use it for growth is an inducible property of various bacteria. Uricases of Bacillus fastidious and of Aspergillus nidulans were reported to be induced by uric acid.
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What will be the total energy shared between an electron and positron, that have been created through pair production from a 10 MeV photon
Answer:
The total energy that an electron and positron share is 5 Mev
Explanation:
One of the potential ways that gamma rays interact with matter is by the formation of positron-electron pairs.
The pair production requires a minimum gamma-energy of 1.02 MeV since an electron's rest mass is equal to 0.511 MeV of energy. The electron-positron pair receives any extra kinetic energy from the pair-producing gamma ray.
The reaction is represented by γ =(. - 1e⁰) + (. + 1e⁰)
E = m₀C² + [tex]KE_{electron}[/tex] + m₀C² + [tex]KE_{positron}[/tex]
10 MeV = 2m₀C² + [tex]KE_{electron}[/tex] + [tex]KE_{positron}[/tex]
[ 2m₀C²= 1.02 ] and since the mass of electron and positron is the same, the Kinetic energy (KE), 1/2 mv² will also be the same
Therefore,
KE = 1/2(10 - 1.02)
=4.49 MeV
[ 2m₀C²= 1.02 so, m₀C² = 1.02/ 2 = 0.51]
Total energy shared = m₀C² + KE
= 0.51 + 4.49
= 5 Mev
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A gas is contained in a thick-walled
balloon. When the pressure
changes from 1.21 atm to 2.52 atm,
the volume changes from 3.75 L to
1.72 L and the temperature changes
from 293 K to____________ K.
Which variable is held constant?
A.P B.V C.n D.T
Thank you! :)
Answer:
C.) n
Explanation:
-----> P = pressure (atm)
-----> V = volume (L)
-----> T = temperature (K)
-----> n = number of moles
According to the problem, it seems like pressure (P), volume (V), and temperature (T) are all changing. The problem never brings up whether the number of moles (n) has changed. Therefore, the number of moles (n) must have been held constant.
________________________________________________________
If you need to know what the temperature changes to....
When the number of moles is held constant, you can find the change in the other variables using the Combined Gas Law equation:
P₁V₁ / T₁ = P₂V₂ / T₂
In this formula, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. You can find the final temperature by plugging in the given values and simplifying.
P₁ = 1.21 atm P₂ = 2.52 atm
V₁ = 3.75 L V₂ = 1.72 L
T₁ = 293 K T₂ = ? K
P₁V₁ / T₁ = P₂V₂ / T₂ <----- Equation
(1.21 atm)(3.75 L) / (293 K) = (2.52 atm)(1.72 L) / T₂ <----- Insert values
0.015486 = (2.52 atm)(1.72 L) / T₂ <----- Simplify left side
0.015486 = 4.3344 / T₂ <----- Multiply 2.52 and 1.72
0.015486 x T₂ = 4.3344 <----- Multiply both sides by T₂
T₂ = 279.885 <----- Divide both sides by 0.015486
T₂ = 280 K <----- Answer in correct sig figs
How many grams of magnesium chloride must be added to 725 mL of water to create a solution with an anion concentration equal to 0.800 M
55.2218 grams of magnesium chloride must be added to 725 mL of water to create a solution with an anion concentration equal to 0.800 M.
How to calculate the no. of moles ?To calculate the number of moles from molarity as
[tex]\frac{\text{x moles}\ MgCl_2}{0.725\ \text{L solution}} = \frac{0.8\ \text{moles}\ MgCl_2}{1.0\ \text{L solution}}[/tex]
x moles MgCl₂ = [tex]\frac{0.8\ \text{moles}\ MgCl_2}{1.0\ \text{L solution}} \times 0.725\ \text{L solution}[/tex]
= 0.58 moles MgCl₂
What is Molar Mass ?Mass of one mole of substance is known as molar mass.
Molar mass of MgCl₂ = Atomic mass of Mg + 2 (Atomic mass of Cl)
= 24.31 + 2 (35.5)
= 95.21
Convert moles to grams
0.58 moles MgCl₂ × [tex]\frac{95.21\ g}{1\ \text{mole}\ MgCl_2}[/tex]
= 55.2218 grams
Thus from the above conclusion we can say that 55.2218 grams of magnesium chloride must be added to 725 mL of water to create a solution with an anion concentration equal to 0.800 M.
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Can someone help me please?
Answer:
3 moles Al2O3
Explanation:
See attached image.
Glucose is a sugar that can be reduced to produce a/an {blank}. Group of answer choices aldehyde alcohol ketone carboxylic acid
Glucose is a sugar that can be reduced to produce an alcohol (option B). Details about glucose reduction can be found below.
What is reduction in chemistry?Reduction is a reaction in which electrons are gained and valence is reduced.
Reduction can also mean the removal of oxygen or the addition of hydrogen to a substance.
Glucose is a chemical compound and sugar with the chemical formula of C6H12O6, however, it can undergo reduction reaction to produce alcohol/ethanol (C2H5OH) in a process called fermentation.
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Steric strain in a large molecule is often reduced by changes in torsion angles. However, in smaller sets of fused benzene rings, like phenanthrene and 3,4-benzophenanthrene (shown below), the first geometric parameters to vary from reference values are found to be the central bond lengths and bond angles. Why do they expand to relieve steric strain before the molecule undergoes torsion to a non-planar structure?
The molecule expand to relieve steric strain before undergoing torsion to a non-planar structure in order to have several resonating structures.
What is a molecule?It should be noted that a molecule simply mean the group of atoms that are bonded together that represents the smallest fundamental unit if the chemical compound.
It should be noted that structures containing fused benzene rings have extensive conjugation. Due to this, they can undergo resonance.
This is vital in decreasing the overall energy of the molecule and helps increase its stability. When there's a change in torsion angle to relieve the steric strain, the molecule won't be planar, hence, the energy will increase and the stability will reduce.
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Consider the reaction, CS2(l)+3O2(g)→CO2(g)+2SO2(g) . The rate of change of CS2(g) is – 0.012 M/s . What is the rate of change of SO2(g) ?
The rate of change of [tex]SO_2[/tex](g)=0.024M/s when the rate of change of [tex]CS_2(g)[/tex] is – 0.012 M/s.
What is the rate of reaction?Reaction rate, in chemistry, is the speed at which a chemical reaction proceeds.
[tex]CS_2(l)+3O_2(g)[/tex] → [tex]CO_2(g)+2SO_2(g)[/tex]
[tex]Rate = \frac{-dcs_2}{dt} =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}[/tex]
Rate = \frac{-dcs_2}{dt} =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}
Given:
[tex]\frac{-dcs_2}{dt} =-0.012 M/s[/tex]
[tex]\frac{-dcs_2}{dt} =\frac{dso_2}{dt}[/tex]
[tex]\frac{dso_2}{dt}=0.024M/s[/tex]
The rate of change of [tex]SO_2[/tex](g)=0.024M/s
Hence, the rate of change of [tex]SO_2[/tex](g)=0.024M/s
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How many moles of hydrogen atoms are contained in one mole of C6H12?
Answer:
72264x10²³moles
Explanation:
By Avogadro constant one mole of a substance is equal to 6022x10²³. so 12 hydrogen atoms =
12×6022x10²³=72264x10²³ moles.
Which Anion is this?:
CO2 – 3
(a) Nitrate
(b) Carbonate
(c) Nitrite
(d) Sulphate
Answer:
Carbonate
Explanation:
Carbonate is a combination of a carbon atom and two oxygen atoms for form a compound.
What is the pH of a solution with a
POH of 2.1?
Answer:
11.9
Explanation:
ph=poh-14 and vice versa. Always subtract by 14