Stoichiometry: Problem Sheet 2



Name: [ANSWER KEY] Date:____________ Period:______

WS Stoichiometry #3 [KEY]

Directions: Solve each of the following problems. Show your work, including proper units, to earn full credit.

1. CaCl2 + 2 AgNO3 ( Ca(NO3)2 + 2 AgCl

How many moles of AgCl (silver chloride) are produced when 3.5 mol of CaCl2 (calcium chloride) react?

3.00 mol CaCl2 x (2 mol AgCl) = 6.00 mol AgCl

(1 mol CaCl2)

2. CuO + H2 ( Cu + H2O

How many grams of H2 are needed to react with 8.12 moles of CuO ?

8.12 mol CuO x (1 mol H2) x (2.02 g H2) = 16.4 g H2

(1 mol CuO) (1 mol H2)

3. 2 Na + 2 H2O ( 2 NaOH + H2

If 3.26 moles of H2 are produced in the above reaction, what mass of Na was used?

3.26 mol H2 x (2 mol Na) x (22.99 g Na) = 150 g Na

(1 mol H2) (1 mol Na)

4. CH4 + 2 O2 ( CO2 + 2 H2O

How many moles of CH4 are needed to completely react with 5.08 moles of O2 ?

5.08 mol O2 x (1 mol CH4) = 2.54 mol CH4

(2 mol O2)

5. CS2 + 2 O2 ( CO2 + 2 SO2

How many grams of CS2 will react with 84.3 g of O2 ?

84.3 g O2 x (1 mol O2) x (1 mol CS2) x (76.13 g CS2) = 100. g CS2

(32.00 g O2) (2 mol O2) (1 mol CS2)

6. C2H6 ( C2H4 + H2

If 56.2 g of C2H6 are broken down, what mass of H2 gas is produced?

56.2 g C2H6 x (1 mol C2H6) x (1 mol H2) x (2.02 g H2) = 3.77 g H2

(30.08 g C2H6) (1 mol C2H6) (1 mol H2)

7. 3 Fe + 4 H2O ( Fe3O4 + 4 H2

If 6.85 moles of H2 are produced, how many grams of Fe were used in the reaction?

6.85 mol H2 x (3 mol Fe) x (55.85 g Fe) = 287 g Fe

(4 mol H2) (1 mol Fe)

8. 2 KClO3 ( 2 KCl + 3 O2

If 120 g of KClO3 are reacted, what mass of O2 is produced?

120 g KClO3 x (1 mol KClO3) x (3 mol O2) x (32.00 g O2) = 47.0 g O2

(122.55 g KClO3) (2 mol KClO3) (1 mol O2)

9. 2 NaI + Cl2 ( 2 NaCl + I2

How many moles of I2 are liberated if 546 g of Cl2 react?

546 g Cl2 x (1 mol Cl2) x (1 mol I2) = 7.70 mol I2

(70.90 g Cl2) (1 mol Cl2)

10. Cu + 2 AgNO3 ( Cu(NO3)2 + 2 Ag

How many grams of Ag will be produced if 80.6 g of Cu are used?

80.6 g Cu x (1 mol Cu) x (2 mol Ag) x (107.87 g Ag) = 274 g Ag

(63.55 g Cu) (1 mol Cu) (1 mol Ag)

11. (NH4)2SO4 + Ca(OH)2 ( CaSO4 + 2 NH3 + 2 H2O

How many grams of NH3 are produced by using 25.1 g of Ca(OH)2 ?

25.1 g Ca(OH)2 x (1 mol Ca(OH)2) x (2 mol NH3) x (17.04 g NH3) = 11.5 g NH3

(74.10 g Ca(OH)2) (1 mol Ca(OH)2) (1 mol NH3)

12. 2 NaCl + H2SO4 ( 2 HCl + Na2SO4

If 359 g of NaCl are consumed in the reaction, how many moles of Na2SO4 are produced?

359 g NaCl x (1 mol NaCl) x (1 mol Na2SO4) = 3.07 mol Na2SO4

(58.44 g NaCl) (2 mol NaCl)

13. 3 AgC2H3O2 + Na3PO4 ( Ag3PO4 + 3 NaC2H3O2

What mass of AgC2H3O2 (silver acetate) will react with 1.54 mol of Na3PO4 ?

1.54 mol Na3PO4 x (3 mol AgC2H3O2) x (166.92 g AgC2H3O2) = 771 g AgC2H3O2

(1 mol Na3PO4) (1 mol AgC2H3O2)

14. 2 HgO ( 2 Hg + O2

What mass of HgO is required to produce 8.12 g of O2 ?

8.12 g O2 x (1 mol O2) x (2 mol HgO) x (216.59 g HgO) = 110 g HgO

(32.00 g O2) (1 mol O2) (1 mol HgO)

BONUS: (a little something different to do here)

15. 2 Al + 6 HCl ( 2 AlCl3 + 3 H2

How many molecules of H2 are produced by reacting 158.6 g of Al with excess HCl ?

5.308 x 1024 molecules H2

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