Ba(h2po4)2 + ba(oh)2( ba3(po4)2 + ca(hco3)2 + khso3 + nh3 [fe(oh)2]2so4 +koh

1) ba(h2po4)2 + ba(oh)2 = 2bahpo4 + 2h2o; 2) ba3(po4)2 + 3h3po4 = 2ba(h2po4)2 + bahpo4; 3) ca(hco3)2 + kcl #; 4) 2khso3 + 2nh3 = k2so3 + (nh4)2so3; 5) [fe(oh)2]2so4 + 2koh = 2fe(oh)3 + k2so4;

Решение:   1. расчет молярной массы cₐhₓ: m(cₐhₓ) = d(n₂)*m(n₂) - 1,57/28г/моль = 44 г/моль  2. w(h) = 100% - w(c) = 100% - 81.8% = 18.2% w(c) = [a*ar(c)]/[mr(cₐhₓ)]*100% 81,8% = (12*a)/(44) *100% a = 3 w(h) = [x*ar(h)]/[mr(cₐhₓ)]*100% 18.2% = (x)/(44) *100% x = 8 формула: c₃h₈ - пропан