Moles and Grams Stoichiometry Practice
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2 Cu + O​2​ --> 2 CuO
1. What is the number of grams of O​2 (molar
mass O​2​: 32.0 g/mol) ​ needed
to produce
​
​
0.7684 moles of CuO?
4NH​3​ + 3O​2 -->
2N​2​ + 6H​2​O
​
2. What is the amount of grams of N​2​ ​(molar mass N​2​: 28.0 g/mol) ​produced if 68.6 grams
of NH​3​ ​(molar mass NH3​ ​: 17.0 g/mol) ​react?
Mg + 2 HCl --> MgCl​2​ + H​2
3. How many grams of MgCl​2​ ​(molar mass MgCl2​ ​: 95.3 g/mol) ​is produced if 4.67 moles of
HCl react?
3 Fe​2​O​3​ + CO --> 2 Fe​3​O​4​ + CO​2
4. How many moles of Fe​2​O​3​ can be converted with 14 moles of Fe​3​O​4​?
4 NH​3​ + 5 O​2​ ----> 4 NO + 6 H​2​O
5. How many grams of O​2 (molar
mass O2​ :​ 32.0 g/mol)​ are needed to react with 56.8 grams
​
of NH​3​ ​(molar mass NH3​ :​ 17.0 g/mol) ​by this reaction?