Ответ:
1.
дано
m(Mg) = 7.2 g
-----------------
m(MgCL2)-?
Mg+2HCL-->MgCL2+H2
M(Mg) = 24 g/mol
n(Mg) = m/M = 7.2 / 24 = 0.3 mol
n(Mg) = n(MgCL2) = 0.3 mol
M(MgCL2) = 95 g/mol
m(MgCL2) = n*M = 0.3 * 95 = 28.5 g
ответ 28.5 г
2.
дано
m(Fe) = 14 g
+H2SO4
--------------------
m(FeSO4)-?
V(H2) -?
Fe+H2SO4-->FeSO4+H2
M(Fe) = 56 g/mol
n(Fe) = m/M =14/ 56 = 0.25 mol
n(Fe) = n(FeSO4) = n(H2) = 0.25 mol
M(FeSO4) = 152 g/mol
m(FeSO4) = n*M = 0.25 * 152 = 38 g
V(H2) = n*Vm = 0.25 * 22.4 = 5.6 L
ответ 38 г, 5.6 л
Объяснение: