# Answer to Question #56213 in Organic Chemistry for Ash

Question #56213

From 3 rations of C2H2:O2, determine which has the most complete combustion reaction using balanced chemical reactions. The three ratios are: 100:0, 5:1 and 1.7:1

Expert's answer

Equilibrium of combustion reaction:

2C

We need to have more oxygen for the same quality of the acetylene for more complete combustion.

We have three ratios:

The first ratio is 100:0. Here we have no oxygen. The combustion is impossible.

The second and third ratios have acetylene and oxygen: 5:1 and 1.7:1. Divide the both ratios into share of acetylene:

5:1 = 5/5:1/5 = 1:0.2

1.7:1 = 1.7/1.7 : 1/1.7 = 1:0.6

Third ratio has more complete combustion than second ration, because third ratio has more oxygen for the same quality of the acetylene.

Answer: third ratio.

2C

_{2}H_{2}+ 5O_{2}→ 4CO_{2}+ 2H_{2}OWe need to have more oxygen for the same quality of the acetylene for more complete combustion.

We have three ratios:

The first ratio is 100:0. Here we have no oxygen. The combustion is impossible.

The second and third ratios have acetylene and oxygen: 5:1 and 1.7:1. Divide the both ratios into share of acetylene:

5:1 = 5/5:1/5 = 1:0.2

1.7:1 = 1.7/1.7 : 1/1.7 = 1:0.6

Third ratio has more complete combustion than second ration, because third ratio has more oxygen for the same quality of the acetylene.

Answer: third ratio.

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