1.3a. Concentration of liquified natural gas.
A sample of liquified natural gas, LNG, from Alaska has the following molar composition: 93.5% CH4, 4.6% C2H6, 1.2% C3H8, and 0.7% CO2. Calculate:
a) Average molecular weight of the LNG mixture.

Solution
b) Weight fraction of CH4 in the mixture.

Solution

Basis: 100 kmoles of LNG
c) The LNG is heated to 300 K and 140 kPa, and vaporizes completely. Estimate the density of the gas mixture under these conditions.

Solution