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I am stuck on an AP Chemistry Review worksheet. Could someone help please?

I am stuck on an AP Chemistry Review worksheet. Could someone help please?1. Potassium chlorate decomposes to form potassium chloride and oxygen gas. If 5.4 moles of potassium chlorate decompses, how many moles of oxygen gas could be produced? The reaction for the decomposition of potassium chlorate is

2 KClO3 --------> 2 KCl + 3 O2

2. When ammonia burns in pure oxygen, the reaction is:

4 NH3 + 3 O2 ----------> 2 N2 + 6 H2O

What masses of nitrogen AND water could be produced from 45.0 g of ammonia?

3. The reaction of carbon and zinc is important in the steel industry. The UNBALANCED reaction is listed below for you.

C + ZnO ----------> Zn + CO2

When 6.50 g of carbon rect with 10.0 g of zinc oxide,

a. What is the limiting reactant for this situation?

b. What is the excess reactant for this situation?

c. What is the theoretical yield?

4. 59.6 g of magnesium carbonate decomposes to form magnesium oxide and carbon dioxide. When the reaction is done, a chemist isolates 23.4 g of magnesium oxide.

MgCO3 ----------> MgO + CO2

a. What is the theoretical yield for this situation?

b. What is the percent yield for this experimentation?

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