Ответ:
дано
m(ppa HCL) = 73 g
W(HCL) = 10%
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m(Zn) = ?
m(HCL ) = 73*10% / 100% = 7.3 g
Zn+2HCL-->ZnCL2+H2
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 7.3 / 36.5 = 0.2 mol
n(Zn) = 2n(HCL)
n(Zn) = 0.2/ 2 = 0.1 mol
M(Zn) = 65 g/mol
m(Zn) = n*M = 0.1*65 = 6.5 g
ответ 6.5 г
Объяснение: