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Ответ

Ответ дан
kononovfelix

Ответ:

Знайдемо молярну масу Na2CO3.

M(Na2CO3) = 2*23 + 1*12 + 3*16 = 46+12+48=106 гмоль

По формулі m = n * M, де m - маса, n - кількість речовини, М - молярна маса, знаходимо масу Na2CO3

1,5 моль Na2CO3 = 1,5 * 106 = 159 г

0,75 моль Na2CO3 = 0,75 * 106 = 79,5  г

1 моль Na2CO3 = 1 * 106 = 106 г

2 моль Na2CO3 = 2 * 106 = 212 г

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