Mr(C2H6) = 12*2 + 1*6 = 30
W(C) = Ar(C) * n / Mr(C2H6) *100% = 12 * 2 / 30 *100% = 80%
W(H) = Ar(H) * n / Mr(C2H6) *100% = 1 *6 / 30 *100% = 20%
Mr(C2H6) = 12*2 + 1*6 = 30
W(C) = Ar(C) * n / Mr(C2H6) *100% = 12 * 2 / 30 *100% = 80%
W(H) = Ar(H) * n / Mr(C2H6) *100% = 1 *6 / 30 *100% = 20%