# Answer to Question #18776 in Other Chemistry for Laveeza

Question #18776

octane burns completely in oxygen according to the equation

2C8H18 + 25O2 = 16CO2 =18H20

[a) calculate the volume of oxygen i.e. needed for the comp. combustion of 1 dm3 of octane vapor

b) what mass of water vapor will be formed

2C8H18 + 25O2 = 16CO2 =18H20

[a) calculate the volume of oxygen i.e. needed for the comp. combustion of 1 dm3 of octane vapor

b) what mass of water vapor will be formed

Expert's answer

V(C

V(O

m = n * M;

n = V/ Vm

n(C

n(H

m(H

_{8}H_{18}): V(O_{2}) = 2 : 25V(O

_{2}) = 1 dm^{3}* 25/2 = 12.5 dm^{3}m = n * M;

n = V/ Vm

n(C

_{8}H_{18}) = 1dm^{3}/22.4 dm^{3}/mol = 0.0446 mol;n(H

_{2}O) = 0.0446mol *18/2 = 0.4 molm(H

_{2}O) = 0.4 mol * 18 g/mol = 7.22 g
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