дано
m(MgO) = 120 g
m(HCL) = 210 g
m(MgCL2) - ?
M(MgO) = 40 g/mol
n(MgO) = m/M = 120 / 40 = 3 mol
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 210 / 36.5 = 5.75 mol
n(MgO) < n(HCL)
MgO+2HCL-->MgCL2+H2O
n(MgO) = n(MgCL2) = 3 mol
M(MgCL2) = 95 g/mol
m(MgCL2)= n*M = 3*95 = 285 g
ответ 285 г
2)
дано
m(Mg) = 120 g
m(CL2) = 340 g
m(MgCL2) - ?
M(Mg) = 24 g/mol
n(Mg) = m/M = 120 / 24 = 5 mol
M(CL2) = 71 g/mol
n(CL2) = m/M = 340 / 71 = 4.8 mol
n(Mg) > n(CL2)
Mg+CL2-->MgCL2
n(CL2) = n(MgCL2) =4.8 mol
M(MgCL2) = 95 g/mol
m(MgCL2)= n*M = 4.8*95 = 456 g
ответ 456 г
Объяснение:
