(a) what percentage of methane by weight does a gas of .65 specific gravity cont
ID: 236962 • Letter: #
Question
(a) what percentage of methane by weight does a gas of .65 specific gravity contain if it is composed only of methane and ethane? What percentage by volume? (b) Explain why the percentage by volume is greater than the percentage by weight. Petroleum Engineering-Applied Petroleum Reservior problem. (a) what percentage of methane by weight does a gas of .65 specific gravity contain if it is composed only of methane and ethane? What percentage by volume? (b) Explain why the percentage by volume is greater than the percentage by weight. Petroleum Engineering-Applied Petroleum Reservior problem. (a) what percentage of methane by weight does a gas of .65 specific gravity contain if it is composed only of methane and ethane? What percentage by volume? (b) Explain why the percentage by volume is greater than the percentage by weight. Petroleum Engineering-Applied Petroleum Reservior problem.Explanation / Answer
A)specific gravity of methane =0.554
Specific gravity of ethane = 1.0378
Let the weight fraction of methane be x,
Total mass = 1, mass of methane=x, mass of ethane =1-x
x/0.554 + (1-x)/1.0378 = 1/0.65
1.806 x + 0.9636 - 0.9636 x = 1.538
0.8424 x = 0.5744
x = 0.5744/0.8424 = 0.682
Hence 68.2% by weight
Percentage by volume =1.806x/1.538
= 68.2*1.806/1.538
=80.1 %
B) it is because methane has lesser density. The one with less density will require larger volume for given mass ratio
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