By the reaction of carbon & oxygen, a mixture of CO & CO2 is obtained. What is the composition by mass of the mixture obtaind when 20 grams of O2 reacts with 12 grams of carbon?

Question

Kristin Gibson

Chemistry

27 January, 22:57

By the reaction of carbon & oxygen, a mixture of CO & CO2 is obtained. What is the composition by mass of the mixture obtaind when 20 grams of O2 reacts with 12 grams of carbon?

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Con · Answer 1

M (O₂) = 20g

M (O₂) = 32.0 g/mol

n (O₂) = 20/32.0=0.625 mol

m (C) = 12 g

M (C) = 12.0 g/mol

n (C) = 12/12.0=1.0 mol

2C + O₂ → 2CO

1 mol 0.625 mol 1 mol

0.625-0.5=0.125 mol

2CO + O₂ → 2CO₂

0.250 mol 0.125 mol 0.250 mol

n (CO) = 1 mol - 0.250 mol = 0.750 mol

M (CO) = 28.0 g/mol

m (CO) = 0.750*28.0=21.0 g

n (CO₂) = 0.250 mol

M (CO₂) = 44.0 g/mol

m (CO₂) = 0.250*44.0=11.0 g