# 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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### Empirical and Molecular formula: Homework

I'm working on a high school chemistry book and want to double check one of the homework assignments. The question is for students to write the empirical and molecular formula for 1,2-dichloroethane. ...
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### Attempting to balance a redox reaction using half reactions leaves an unbalanced component

I have this redox reaction that I can't balance using half reaction method. $$\ce{Mg + HNO3 -> Mg(NO3)2 + N2O + H2O}$$ What I get at the end is $$\ce{2Mg + 6HNO3 -> 2Mg(NO3)2 + 3N2O +3H2O}$$...
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### Can 1 mole of H2 react partially with one mole of O2?

I am currently studying stoichiometry (high school level) and we came across the following equation in school: $\ce{2H2 + 1O2 -> 2H2O}$ which is clear to me. We learned in school that reactions ...
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### Law of Definite Proportion: Do the numbers indicating moles count?

I need to find the ratio of a substance as it converts from a bicarbonate to a carbonate: ex: $\ce{Fe(HCO3)2 -> FeCO3 + CO2 + H2O}$ $\ce{Fe(HCO3)2} / \ce{FeCO3}$ = $3/2$ *using molar ...
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### Figuring out formula of a hydrocarbon from amount of products obtained and reactants used

One mole of a hydrocarbon is combusted. The products obtained are cooled down to STP and occupy a volume of $89.6\:\ell$. Oxygen required for conbustion was $145.6\:\ell$ at STP. Find the molecular ...
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### How to determine the empirical formula for an unknown iron oxide?

I have to determine the empirical formula of an oxide of iron which has $69.9\%$ iron and $30.1\%$ dioxygen by mass in it. I have started as follows: For our convenience we take $\pu{100 g}$ of that ...
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### Calcium carbonate and hydrogen phosphate producing calcium phosphate, carbon dioxide, and water

How does the balanced reaction look for these compounds? I found that phosphoric acid instead of hydrogen phosphate creates a much easier problem, but the teacher said hydrogen phosphate and I can't ...
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### Find the volume of the carbon dioxide product

Below you can see the chemical reaction I'm working with: $$\ce{CH_3CH_2OH(l) + 3O_2(g) -> 2CO_2 (g) + 3H_2O(g)}$$ I've got so far: How can I calculate the volume of the product of carbon ...
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### Empirical formula when given percentages?

A binary compound of lead and oxygen contains $90.66 \% \ce{Pb}$. What is the empirical formula for the compound? How do I use the percentage to get to the normal formula, then how do I change the ...
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### Balancing a chemical equation [duplicate]

I'm in chemistry and I still have a hard time comprehending how to balance a chemical equation. What are the main steps and general things to know? thank you.
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### Balancing a chemical equation, but with an incorrect mole ratio

I'm wondering if it's possible to balance a chemical equation with an incorrect mole ratio. I have the unbalanced equation $\ce{AgNO3 + Cu -> Ag + Cu(NO3)2}$, I have a $2:3$ ratio of $\ce{Cu}$ and ...
I have the following question to solve: Tungsten, $\ce{W}$, and chlorine, $\ce{Cl}$, form a series of compounds with the following compositions: \begin{array}{rr} \text{Mass % W} & \text{...