Date:
Class:

## Activity: Stoichiometry Start-up

Do these problems together with your teacher and classmates in order to
have a set of worked examples of how to solve stoichiometry problems.

N2 + 3H2 2NH3
Nitrogen gas reacts with hydrogen gas to make ammonia.
1. If you have 2.5 moles of nitrogen gas, how many moles of hydrogen gas are needed to react with it?
2. Two questions:
1. If you want to make 15 moles of ammonia then how many moles of hydrogen gas are needed?
2. If you want to make 15 moles of ammonia then how many moles of nitrogen gas are needed?
3. Write and balance a chemical equation, then perform a stoichiometry calculation:
Methane (CH4) reacts with oxygen gas to make carbon dioxide and water vapor.
How many moles of carbon dioxide form when 12.5 moles of methane are burned?
3NiCl2 + 2Al —> 3Ni + 2AlCl3
Nickel(II) chloride reacts with aluminum metal to form nickel metal and aluminum chloride.
1. If you have 59.3 g of Al then how much Ni can be formed (in grams), assuming you react the aluminum with enough nickel(II) chloride?
2. How many grams of aluminum metal are required to react with 134.5 g of nickel(II) chloride?
3. Fermentation is a complex chemical process of wine making in which glucose is converted into ethanol and carbon dioxide:
C6H12O6 2C2H5OH + 2CO2
Starting with 354 g of glucose, what is the maximum amount of ethanol in grams and in milliliters that can be obtained by this process? (Density of ethanol = 0.798 g/mL.)
Last updated: Apr 30, 2014       Home