дано
n(CaCL2) = 0.3 mol
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m(CaCO3)-?
CaCL2+Na2CO3-->2NaCL+CaCO3↓
n(CaCL2) = n(CaCO3) = 0.3 mol
M(CaCO3) = 100 g/mol
m(CaCO3) = n*M = 0.3*100 = 30 g
ответ 30 г
дано
n(NaCL) = 0.8 mol
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m(Na2CO3) -?
CaCL2+Na2CO3--->2NaCL+CaCO3
n(Na2CO3) = n(NaCL) / 2 = 0.8 / 2 = 0.4 mol
M(Na2CO3) = 106 g/mol
m(Na2CO3) = n*M = 0.4 * 106
m(Na2CO3) = 42.4 g
ответ 42.4 г