Stoichiometry Worksheet

1. Given the following equation: 2 C_{4}H_{10} + 13 O_{2} ---> 8 CO_{2} + 10 H_{2}O, show what the following molar ratios should be.

a. C_{4}H_{10}/ O_{2}

b. O_{2}/ CO_{2}

c. O_{2}/ H_{2}O

d. C_{4}H_{10}/ CO_{2}

e. C_{4}H_{10}/ H_{2}O

2. Given the following equation: 2 KClO_{3} ---> 2 KCl + 3 O_{2}

How many moles of O_{2} can be produced by letting 12.00 moles of KClO_{3} react?

3. Given the following equation: 2 K + Cl_{2} ---> 2 KCl

How many grams of KCl is produced from 2.50 g of K and excess Cl_{2}. From 1.00 g of Cl_{2} and excess K?

4. Given the following equation: Na_{2}O + H_{2}O ---> 2 NaOH

How many grams of NaOH is produced from 1.20 x 10^{2} grams of Na_{2}O? How many grams of Na_{2}O are required to produce 1.60 x 10^{2} grams of NaOH?

5. Given the following equation: 8 Fe + S_{8} ---> 8 FeS

What mass of iron is needed to react with 16.0 grams of sulfur? How many grams of FeS are produced?

6. Given the following equation: 2 NaClO_{3} ---> 2 NaCl + 3 O_{2}

12.00 moles of NaClO_{3} will produce how many grams of O_{2}? How many grams of NaCl are produced when 80.0 grams of O_{2} are produced?

7. Given the following equation: Cu + 2 AgNO_{3} ---> Cu(NO_{3})_{2} + 2 Ag

How many moles of Cu are needed to react with 3.50 moles of AgNO_{3}? If 89.5 grams of Ag were produced, how many grams of Cu reacted?

8. Molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide and coke (pure carbon). If 25.0 kilograms of pure Fe_{2}O_{3} is used, how many kilograms of iron can be produced? The reaction is: Fe_{2}O_{3} + 3 C ---> 2 Fe + 3 CO

9. The average human requires 120.0 grams of glucose (C_{6}H_{12}O_{6}) per day. How many grams of CO_{2} (in the photosynthesis reaction) are required for this amount of glucose? The photosynthetic reaction is: 6 CO_{2} + 6 H_{2}O ---> C_{6}H_{12}O_{6} + 6 O_{2}

This problem is slightly different from those above.

10. Given the reaction: 4 NH_{3} (g) + 5 O_{2} (g) ---> 4 NO (g) + 6 H_{2}O (l)

When 1.20 mole of ammonia reacts, the total number of moles of products formed is:

a. 1.20 b. 1.50 c. 1.80 d. 3.00 e. 12.0