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Ответ:

5,98*10⁻³ кг = 5,89 г

Объяснение:

m=M/Na - масса одной молекулы, а так как их N, то

m=M/Na*N=4*10⁻³*9*10²³/6.02*10²³=5.89*10⁻³ кг = 5,89 г

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