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Platinum15

Ответ:

Объяснение:

F2

38 г/моль

1.9/38 = 0.05 моль

22.4 *0.05=1.12 л

6*10^23*0.05=3*10^22 молекул

1.9/1.12 =1.7 г/л

38/2 =19

38/29=1.31

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