Ответ:
дано
m(ppa HCL) = 50 g
W(HCL) = 20 %
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m(ZnCL2)-?
m(HCL) = 50 * 20% / 100%= 10 g
Zn+2HCL-->ZnCL2+H2
M(HCL) = 36.5 g/mol
n(HCL) =m/M = 10 / 36.5 = 0.274 mol
2n(HCL) = n(ZnCL2)
n(ZnCL2) = 0.274 /2 = 0.137 mol
M(ZnCL2) = 136 g/mol
m(ZnCL2) = n*M = 0.137 * 136 = 18.632 g
ответ 18.632 г
Объяснение: