27)
дано
m(NaCL)=1 g
H2SO4
--------------------
m(HCL)-?
1 g Xg
2NaCL+H2SO4-->2HCL+Na2SO4
2*58.5 2*36.5
M(NaCL)=58.5 g/mol , M(HCL)=36.5 g/mol
X=1*73/117=0.6 g
ответ 0.6 г
31)
дано
m(AgCL)=287 g
-----------------------------
n(AgNO3)-?
n(HCL)-?
AgNO3+HCL-->AgCL+HNO3
M(AgCL)=143.5 g/mol
n(AgCL)=m/M=287/143.5=2mol
n(AgNO3)=n(AgCL)=2 mol
n(HCL)=n(AgCL)=2 mol
ответ n(AgNO3)= 2 моль ,n(HCL)=2 моль
32)
Дано
m(CH3COO)2Pb=65 kg
------------------------------
m(PbO)-?
X kg 65 kg
2CH3COOH+PbO-->(CH3COO)2Pb+H2O
223 325
M((CH3COO)2Pb)=325 kg
M(PbO)=223 kg
X=223*65 / 325=44.6kg
ответ 44.6 кг