The average molar mass of a natural gas is 17.4g/mol consisting of CH4 and C2H6,what is the molar fraction of each gas?

Answer 1

NG*16+BT*30=17.4
but NG+BT=1.00

(1-BT)16+BT*30=17.4
BT*14=1.4
BT=.0875 or 8.75 percent
NG=.9125 or 91.25 percent