What mass of benzene can be obtained from 22.4 liters of acetylene if the benzene yield is 40%.

It is necessary to draw up the reaction equation 3C2H2 = C6H6
find the amount of C2H2
n (C2H2) = 22.4 / 22.4 = 1 mol
3n (C2H2) = n (C6H6) = 0.1 / 3 = 0.033 mol
m (C6H6) = 0.33 * 78 = 2.54 grams
M (C6H6) = 6 + 12 * 6 = 6 + 72 = 78 grams / mol
40% = (2.574 * 100%) / x
40% x = 2.574 * 100%
x-257.4 / 40
x = 6.43
M (C6H6) = 6.43 grams