Ответ:
1)
дано
n(Al) =0.4 mol
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V(H2) - ?
2Al+6HCL-->2AlCL3+3H2
n(H2) = 0.4 * 3 /2 = 0.6 mol
V(H2) = n*Vm = 0.6 * 22.4 = 13.44 l
ответ 13.44 л
2)
дано
V(H2) = 5.6 L
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m(Fe) -?
Fe3O4 + 4H2-->3Fe+4H2O
n(H2)= V(H2) /Vm = 5.6 / 22.4 = 0.25 mol
n(Fe) = 0.25 * 3 / 4 = 0.1875 mol
M(Fe) = 56 g/mol
m(Fe)= n*M = 0.1875 * 56 = 10.5 g
ответ 10.5 г
3)
дано
m(Hg) = 40.2 g
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m(Cu)-?
Cu+HgCL2-->Hg+CuCL2
M(Hg)= 201 g/mol
n(Hg) = m/M = 40.2 / 201 = 0.2 mol
n(Cu) = n(Hg)
M(Cu) = 64 g/mol
m(Cu) = n*M = 0.2 * 64 = 12.8 g
ответ 12.8 г
Объяснение: