M(Na2CO3) = 23×2 + 12 + 16×3 = 106 г/моль
n(Na2CO3) = 4 моль
m(Na2CO3) = M × n = 106 × 4 = 424 г
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M(Na2CO3) = 23×2 + 12 + 16×3 = 106 г/моль
n(Na2CO3) = 4 моль
m(Na2CO3) = M × n = 106 × 4 = 424 г