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1. If 20.0 g of zinc react with excess hydrochloric acid, how many grams of zinc chloride are produced?

Zn(s) + 2HCl(aq) ( ZnCl2(aq) + H2(aq)

2. How many grams of chlorine gas must be reacted with excess sodium iodide if 10.0 g of sodium chloride is produced?

2NaI(aq) + Cl2(aq) ( 2NaCl(aq) + I2(s)

3. How many grams of copper are required to replace 4.00 g of silver nitrate, which is dissolved in water?

Cu(s) + 2AgNO3(aq) ( Cu(NO3)2(aq) + 2Ag(s)

4. If excess sulfuric acid reacts with 30.0 g of sodium chloride, how many grams of hydrochloric acid are produced?

H2SO4(aq) + 2NaCl(aq) ( Na2SO4(aq) + 2HCl(aq)

5. How many moles of hydrogen can be produced from 8.40 g of aluminum and excess sodium hydroxide?

2Al(s) + 6NaOH(aq) ( 2Na3AlO3(aq) + 3H2(aq)

6. How many moles of calcium chloride would be necessary to prepare 94.0 g of calcium phosphate?

3CaCl2(aq) + 2Na3PO4(aq) ( Ca3(PO4)2(s) + 6NaCl(aq)

7. Calculate the number of grams of oxygen that could be produced by heating 9.70 g of potassium chlorate?

2KClO3(s) ( 2KCl(s) + 3O2(g)

8. 4Al + 3O2 ( 2Al2O3

How many moles of Al2O3 will be formed from 17 moles of Al?

9. Magnesium reacts with hydrochloric acid (HCl) to produce magnesium chloride and hydrogen gas.

Mg + 2HCl ( MgCl2 + H2

If you start with 25.0 g of magnesium, how many liters of hydrogen gas will form?

10. 4NH3 + 5O2 --> 4NO + 6H2O

If you start with 80.0 g of O2, how many grams of NO will you produce?

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