Questions tagged [stoichiometry]

Stoichiometry refers to the relationship between the amounts of substances of the reactants and the amount of substances of the formed products. This tag should be used for specific questions about chemical reaction equations.

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Stoichiometry Questions [closed]

How many grams of carbon monoxide are needed to produce 345 grams of carbon dioxide? Fe2O3 + 3 Co ---> 3c CO2 + 2Fe How many moles of oxygen gas must be used to produce 15 grams of carbon dioxide? ...
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10 g of Carbon is burnt with 22g of O2 to produce both CO and CO2 without any Limiting Reagent. Find mass of CO and CO2 produced [closed]

I read a question as stated above. Is this reaction even possible because as far as I know CO is only produced when there is not enough oxygen. In case it is correct, please provide me with an answer.
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Volume percentage [closed]

When we say that nitrogen occupies 78% , oxygen 21% and other gases 1% by volume of the total volume of air, what do we actually mean by it? I am confused because I have been told that molecules of ...
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Acids give H+ in a reaction thus called reducing agent. But according to Lewis theory of acid and base, anything accepting pair of electron is acid [closed]

Now as acids accept electrons and so must be called oxidizing agent. and I feel it to be a bit contradicting. please clarify if any misconception
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What is the fraction by weight of KBr in the original sample? [closed]

A mixture of KBr and NaBr weighing 0.5600g is treated with Ag+(aq) , and all the bromide ion is recovered as 0.9700g pure AgBr . What is the fraction by weight of KBr in the original sample?? First ...
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4.1 grams of Cr is added to 7.6 grams of Cl2 to produce CrCl3 [closed]

The Actual Yield of CrCl3 is 10.5 grams -Find the Balanced Chemical Equation -Determine the Theoretical Yield of CrCl3 -Determine the limiting reactant -Determine the excess reactant and how much is ...
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When diluting 10 g of KI into 50 ml of water, what is the concentration of the solution in volume percentage? [closed]

Assume that the density of KI is 0.2 g/cm^3. The way I got is that the solution weighs 10g + 50g = 60g, so the volume of solution is 60 / 0.2 = 300 cm^3. But I cannot figure out what is the volume of ...
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Calculation of the concentration of CH3COOH in an acid-base solution with a given resulting pH [closed]

I had some trouble understanding how to calculate the concentration of acetic acid in this question: What should be the concentration of 0.1 liter of CH3COOH to can obtain a pH of 6.8 after the acid-...
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What products are formed when KMnO4 and KI react with each other in “weakly basic” medium?

While solving JEE Advanced 2020 (Paper 2) questions, I came across this particular question: According to the final answer key, its answer is 6. In my chemistry book (NCERT Chemistry), the following ...
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1answer
35 views

Ratio of carbon monoxide and carbon dioxide when carbon and oxygen are made to react [duplicate]

$\pu{12 g}$ of $\ce{C}$ reacts with $\pu{64 g}$ of $\ce{O2}$ to give a mixture of $\ce{CO}$ and $\ce{CO2}$. Find amount of $\ce{CO}$ and $\ce{CO2}$ at the end of reaction. What I tried was to let x ...
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Balancing reaction between copper and nitric acid given the ratio of formed nitrogen oxides

Problem $\ce{Cu}$ reacts with $\ce{HNO3}$ according to the equation $$\ce{Cu + HNO3 -> Cu(NO3)2 + NO + NO2 + H2O}$$ If $\ce{NO}$ and $\ce{NO2}$ are formed in 2:3 ratio, what is coefficient of $\ce{...
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Adjusting redox reactions

$$\ce{KCl + KMnO4 + H2SO4 -> K2SO4 + MnSO4 + H2O + Cl2}$$ Attempt. I want to adjust this redox reaction, I've figured out that Chlorine and Manganese are the 2 elements that change thier oxidation ...
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Calculate concentrations of ions after acid-base reaction given volumes and concentrations

A $\pu{35.0 mL}$ of $\pu{4000 ppm}$ $\ce{HCl}$ solution is mixed with $\pu{45.0 mL}$ of $\pu{0.1025M}$ $\ce{NaOH}$ solution. Assume volumes are additive. $$\ce{NaOH(aq) + HCl(aq) -> NaCl(aq) + H2O(...
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1answer
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Calculating atomic mass of unknown element in given compound (gas) at STP

A gas $\ce{X2O5}$ has the density of $\pu{5 g L-1}$ at STP. What is the atomic mass of $\ce{X}$ given $A_\mathrm{r}(\ce{O}) = 16?$ Note: The problem is my homework for school and has been translated ...
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Finding formula of reduced scandium oxide using its mass and mass of obtained metal

An oxide of scandium, with a mass of $\pu{1.423 g},$ is chemically reduced with $\ce{H2}$ to give $\ce{H2O}$ and $\pu{0.929 g}$ of $\ce{Sc}$ metal. What is the formula of scandium oxide? How much ...
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1answer
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Reaction stoichiometry for calculation of Kp

NH$_2$CO$_2$NH$_4$(s)⇌$2$ NH$_3$(g)+ CO$_2$(g) I want to calculate K$_p$ for the reaction above, given that the total pressure is $0.63$ bar. My calculations: $0.63$ = p(CO$_2$) + p(NH$_3$) , where ...
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What is the mathematical meaning of the plus sign (+) in chemical reaction equations?

Reactants and products are connected with plus signs in a chemical reaction equation, e.g. $$\ce{CH4 + 2 O2 -> CO2 + 2 H2O}.$$ Is there a strict mathematical interpretation of what looks like sums ...
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How to calculate non-stoichiometric ratio [closed]

I'm reading a paper "Photocatalysis-mediated drug-free sustainable cancer therapy using nanocatalyst." Here, the authors synthetise nanoplates of $\ce{SnS_{1.68}}$ with nanodots of $\ce{WO_{...
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1answer
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Using PV = nRT to solve an electrolysis problem

Question: Two electrolytic cells are connected in series (the same current passes through each cell). One cell for the electrolysis of water produces $\pu{100 cm^3}$ of oxygen, measured at $\pu{273 K}$...
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Why do we only take into account the first product while calculating a limiting reactant?

High school chemistry student here. Currently, we are learning stoichiometry and I noticed that when we calculate the limiting reactant of a reaction with multiple products, we almost always just take ...
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Writing a chemical equation with a reactant of unspecified chain length [closed]

Would appreciate it if I got some general tips and hints and not the solution cause I'm trying to learn from this question :) The question is as follows: FA1 is a solution containing $\pu{5.00 g dm-3}...
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Converting w/v to mole fraction

If I have 10 mL 0.9% w/v $\ce{NaCl}$ solution, I can deduce that the solution contains 0.09 g of $\ce{NaCl}$. Imagine that this is standard laboratory conditions and 1 ml = 1 g is acceptable. Is the ...
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Help with two containers problem, Xenon

In two containers we have Xenon. The volume of the first container is 2780 L, temperature is 300 degree Celsius, and n = 200 mol. Volume of the second container is 4000 L, temperature is 1300 degrees ...
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Is this stoichiometric question answerable? (unknown variable)

This question kind of borders on the fields of both semantics and math, as well as chemistry, but I still believe this is the right place to ask. On a test I took, a question was posed as such: Via ...
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Calculating change in Gibbs Free Energy for a specific type of problem

Can anyone describe what is going on here? $$Si(liq.)=Si_{(1 weight percentFe)}$$ I have come across this statement quite a few times in Metallurgical Thermodynamics.All that they ask for is change in ...
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Filling up a table about a chemical reaction

I am filling up this table but I'm not sure about what it means in the mass row, amount of substance, molecule quantity. In mass do I just have to repeat 16 in the second column or do I need to put ...
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When multiple sources give the content of an ingredient my an unqualified percentage, can I safely assume this is by weight? Or; it's not a wart

I am trying to make a simple scented shampoo and body soap for my own use and for Christmas gifts. I statr with a base of 32 oz – (a bit under a kg) of a mild commercial castille soap (Dr. Bronner’s ...
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Find the molecular formula of a gas

The problem is: A quantity of $\pu{35.2 g}$ if a certain hydrocarbon gas, occupies $\pu{13.2 L}$, measured at $\pu{1 atm}$ and at $\pu{323 K}$. Knowing that 85.5% of is C, find the molecular formula ...
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Molarity of a mix between solid and solution

$\pu{50 g}$ of solid $\ce{NaOH}$ is added to $\pu{1.5 L}$ of $\pu{2.4 M}$ $\ce{NaOH}.$ Water is then added to the mix until the solution reaches $\pu{5 L}.$ I need to find molarity of the final ...
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When blue vitriol is dissolved in water [closed]

when CuSO4.5H2O is dissolved in water, what physical and chemical effects happens to its water of crystallization? While solving a stoichiometric problem the ques was that 1litre of CuSO4.5H2O was ...
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1answer
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Is this calculation of the amount of required hydrogen gas correct?

I was a bit hesitant to post this question for it may appear like a "homework help" type of question. But upon rethinking it felt like a genuine question. I was studying stoichiometry with ...
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Why does the Avogadro's number have the unit of reciprocal mole? [closed]

In my understanding, $$1 \ mol \equiv N_A \ (atoms)$$ (Don't say it might not be atoms but molecules and also don't say what's it's not even a unit) Then the unit should be $N_A = 1 \ mol/atoms = 1 \ ...
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1answer
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What does the term 'by mass' mean with respect to different contexts?

I've seen the term 'by mass' being used in various sorts of contexts. Some, while explaining the law of definite proportions say, the 'same proportions by mass', some say 'constant chemical ...
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Combustion of methane and ethane

I'm having trouble with the following problem: A gas fuel of Methane ($\ce{CH4}$) and Ethane ($\ce{C2H6}$) is burned with atmospheric air, and the volumetric analysis of the products of combustion ...
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Finding the equivalent weights of the oxide and the metal when reduced by hydrogen [closed]

A metal oxide ($\pu{1.80 g}$) required $\pu{833 ml}$ of hydrogen at NTP to be reduced to its metal. What are the equivalent weights of the oxide and the metal? My attempt: $$\text{equivalent of metal ...
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How much grams oxygen is in 7 gram magnesiumnitrate? Mg(NO3)2 [closed]

I calculated this: molar mass (M) of Mg(NO3)2 is 148,32 (24,3 + 214,01 + 616) so when there is 7 grams Mg(NO3)2 there is 0,0472 mol (7/148,32) But how do i find out how much of that is oxygen? Do i ...
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What does the equilibrium constant mean for reactions with very small concentrations?

When you calculate the equilibrium constant for a reaction with a higher concentration of reactants, the answer is fairly intuitive. For example, for the reaction: $$\ce{A + B <=> C}$$ Where we ...
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Balancing a reaction where dichromate ion reacts with ethanol to give Cr(III) and carbon dioxide

I have only started to learn balancing redox reactions, and a recent question has me confused. The question is : Balance in both acidic medium and basic medium: $$\ce{Cr2O7^2- + C2H5OH -> Cr^3+ + ...
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Question about null space balancing method

I'm trying to use the null space method to balance the following equation: . I obtained the following composition matrix: $$\begin{bmatrix} 3 & 8 & 1 & 12 & 4 & 2 \\ 1 & 0 &...
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Finding the volume of carbon dioxide needed in formation of calcium carbonate

Carbon dioxide was bubbled into limewater (a solution of calcium hydroxide) and the solid calcium carbonate precipitated was filtered off, dried and weighed. If $\pu{0.50 g}$ of calcium carbonate were ...
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What is the liquid which has the most hydrogen atoms per volume?

What is the liquid which has the most hydrogen atoms per volume at STP ? Is there anything better than water? This answer does not answer this question because none of the compounds listed in it are ...
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Number of moles of acidified potassium dichromate required to liberate 6 moles of iodine from an aqueous solution of iodate ions

I came across this question in a recent exam I had taken: How many moles of acidified $\ce{K2Cr2O7}$ is required to liberate 6 moles of $\ce{I2}$ from an aqueous solution of $\ce{I-}$ ? So this is ...
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Stoichiometric calculation of composition of a compound

I have a question from a high school review package. I don't need the answer, but one thing that is bugging me is that, I feel as if I do not understand the question at all. I don't know what it wants ...
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Calculation of pH in acid base reaction

This problem(from ionic equiibrium) states: We are given $\pu{40 mL}$ of $\pu{0.1 M}$ $\ce{HCl}$ and $\pu{10 mL}$ of $\pu{0.45 M}$ $\ce{NaOH}$ in two separate beakers. These two solutions are mixed. ...
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Dissolution of iron(III) hydroxide

Problem From the theoretical tour of the Mendeleev Olympiad in Chemistry: a) Calculate the minimal amount of sulfuric acid that should be diluted with water to yield $\pu{100 mL}$ of solution that ...
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Why use 1.008 g/mol instead of 1.0079 g/mol calculating the number of moles in 75.0 g H_2 molecules? [closed]

Why are figures removed from the calculation for values that are known in more detail? E.g. if you want to calculate the number of moles in 75.0 g H2 molecules. Why should one here use for the ...
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Stoichiometry and percentage concentration [closed]

10 g of Mg(NO3)2 was dissolved in 120 g of water. The result is a solution with a density of 1.12 g / ml. Determine the percentage concentration (in %) and the molar concentration (in mol/L) of the ...
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How many kilograms of graphite are consumed while producing 4 kg of Al through Hall-Heroult process?

How many kilograms of graphite are consumed while producing 4 kg of $\ce{Al}$ through Hall-Heroult process? This looks like a simple stoichiometry problem: $$\ce{4Al^3+ + 12e- -> 4Al} \; \; \; \; \...
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Can the Belousov-Zhabotinsky reaction be simulated with the Brusselator?

I'm trying to simulate the Belousov-Zhabotinsky reaction mathematically, with a system of ODEs. I know how to do this with the Oregonator and now I'm looking for another model to simulate the BZ-...
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1answer
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Does the property of additivity for the amounts of different substances hold up for ideal gas law?

A mixture contains $\pu{8.00 g}$ each of $\ce{O2},$ $\ce{CO2},$ and $\ce{SO2}$ at STP. Calculate the volume of this mixture. Which of the gases would exert the greatest pressure and why? Here is my ...

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