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ответ: 6,72 л.
Дано:
m(Ca)=12 г.
M(Ca)=40 г/моль;
M(H2)=2 г/моль ;
Найти:
V(H2) - ?
Решение: Ca+H2SO4 = H2 + CaSO4
n(Ca)=m/M = 12 г. / 40 г/моль = 0,3 моль
n(Ca) : n (H2) = 1:1
n(H2) = 0,3 моль
V(H2)= n*Vm = 0,3 моль * 22,4 л/моль = 6,72 л.