C + 2H2 ⇄ CH4
initial : a (kmoli) b
au reactionat x 2x
la echilibru : (a -x) (b - 2x) x
" " " " "" " " : n gaze = b - x
x = 0,97(b-x) 1,97x = 0,97b
(b-x)·22,4 = 100 b - x = 100/22,4 x = 97/22,4 = 4,33 kmoli
b = 197/22,4 = 8,794 kmoli
a = b/2 = 4,397kmoli mC pur = 52,767kg
m carbune = 52,767·100/70 = 75,382kg