Дано
m(ppa H2SO4) = 63 g
W(H2SO4)= 40%
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V(H2)-?
m(H2SO4) = 63*40%/100% = 25.2 g
H2SO4+Zn-->ZnSO4+H2
M(H2SO4)= 98 g/mol
n(H2SO4)= m/M= 25.2/98 = 0.26 mol
n(H2SO4) = n(H2)=0.26 mol
V(H2)= n(H2)*Vm=0.26*22.4 = 5.824 L
ответ 5.824 л