W(H) = Ar(H) * n / Mr(C5H12) * 100% = 1 * 12 / 72 *100% = 16,66%
W(H) = Ar(H) * n / Mr(C6H6) * 100% = 1 * 6 / 78 *100% = 7,69%
W(H) = Ar(H) * n / Mr(CH4) *100% = 1 * 4 / 16 *100% = 25%
W(H) = Ar(H) *n / Mr(C4H10) *100% = 1 * 10 / 58 *100% = 17,24%
Массовая доля водорода больше у метана.
CuO + H2SO4 = CuSO4 + H2O
98gr H2SO4 - 160 gr CuSO4
29,4 - X
X = 48 gr
98 gr H2SO4 - 18 gr H2O
29,4 - X
X = 5,4 H2O
С2H4 + Br2 = C2H4Br2
n (Br2) = 2.24/22.4 = 0.1 моль => n (Br2) = 0.1 моль
n = m/M; m = n*M; m (Br2) = 0,1*160=16 г