Analía Bellizzi – Chemistry Classes

Ronald Reagan Senior High School

Stoichiometry Problems #2 – HOMEWORK

Before resolving this problems, may be you want to review the concepts of stoichiometry by watching the following videos:

1.  Magnesium – Mg reacts with hydrochloric acid – HCl to produce magnesium chloride – MgCl2 and hydrogen gas H2.
1. Write the balanced equation for this reaction.
2. If you start with 25.0 g of magnesium and Hydrochloric acid in excess, how many grams of hydrogen gas will form?
3. If you start with 140.0 g of hydrochloric acid, how many moles of magnesium will react?
2.  Ammonia (NH3)and oxygen combine to form nitrogen monoxide (NO) and water
1. Write the equation and balance it.
2. If you start with 80.0 g of O2, how many grams of nitrogen monoxide will you produce?
3. How many grams of H2O will you make with 80 g of O2?
3.  Iron (III) Oxide plus carbon monoxide gas yields iron metal and carbon dioxide gas
1. Write the balanced equation for this reaction.
2. How many grams of Fe are made if 0.576 moles of CO2 are produced?
3. If 100.0 g CO react, how many grams of iron metal are produced?
4.  Lead (II) oxide and oxygen gas react to form lead (IV) oxide.
1. Write the balanced equation for this reaction.
2. How many moles of lead (IV) oxide will be formed from 334.8 g of lead (II) oxide?
3. How g of product will form?
5.  Nitrogen gas and hydrogen gas combine to form ammonia gas (NH3)
1. Write the balanced equation for this reaction
2. One mol of any gas occupies 22.4 dm3 at room temperature.
How many liters of ammonia will be produced from 7.2 moles of hydrogen gas?
3. How many grams of nitrogen are needed to produce 4.6 moles of ammonia?
6. Pentane (C5H12) combustion reaction is as follows:      C5H12 + O2 —> CO2 + H2O
1. Write the balanced equation for this reaction
2. How many grams of carbon dioxide form from 320.0 g of pentane?
3. How many grams of water are produced if 200.0 g of CO2 are produced?
4. You start with 150.0 g of pentane. How many grams of H2O will you make?