12.2 Practice Problems

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# 12.2 Practice Problems - PowerPoint PPT Presentation

12.2 Practice Problems. 13. Acetylene gas (C 2 H 2 ) is produced by adding water to calcium carbide (CaC 2 ). CaC 2 (s) + 2H 2 O(l)  C 2 H 2 (g) + Ca(OH) 2 (aq) How many grams of acetylene are produced by adding water to 5.00 g CaC 2 ?. g. 2.03. 5 g. 5 g CaC 2. 1. mol CaC 2. 1.

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12.2 Practice Problems

13. Acetylene gas (C2H2) is produced by adding water to calcium carbide (CaC2).

CaC2(s) + 2H2O(l)  C2H2(g) + Ca(OH)2(aq)

How many grams of acetylene are produced by adding water to 5.00 g CaC2?

g

2.03

5 g

5 g CaC2

1

mol CaC2

1

mol C2H2

g C2H2

26

x

x

x

1

64

g CaC2

1

mol CaC2

1

mol C2H2

CaC2:

Ca: 1 x 40 = 40

C: 2 x 12 = 24

C2H2:

C: 2 x 12 = 24

H: 2 x 1 = 2

64 g/mol

26 g/mol

26

x 5

2.03

)

130

64

130

12.2 Section Assessment

24. The combustion of acetylene gas is represented by this equation:

2C2H2(g) + 5O2(g)  4CO2(g) + 2H2O(g)

How many grams of CO2 and H2O are produced when 52.0 g C2H2 burns in oxygen?

176

g

52.0 g

1

mol C2H2

52.0 g C2H2

4

mol CO2

44

g CO2

x

x

x

1

26

g C2H2

2

mol C2H2

1

mol CO2

C2H2:

C: 2 x 12 = 24

H: 2 x 1 = 2

----------------------

26 g/mol

CO2:

C: 1 x 12 = 12

O: 2 x 16 = 32

----------------------

44 g/mol

= 176 g CO2

12.2 Section Assessment

24. The combustion of acetylene gas is represented by this equation:

2C2H2(g) + 5O2(g)  4CO2(g) + 2H2O(g)

How many grams of CO2 and H2O are produced when 52.0 g C2H2 burns in oxygen?

176 g

36 g

1

mol C2H2

52.0 g C2H2

2

mol H2O

18

g H2O

x

x

x

1

26

g C2H2

2

mol C2H2

1

mol H2O

C2H2:

C: 2 x 12 = 24

H: 2 x 1 = 2

----------------------

26 g/mol

H2O:

H: 2 x 1 = 2

O: 1 x 16 = 16

----------------------

18 g/mol

= 36 g H2O