Найдите массу вещества 0,602*10^24 молекул азота
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n=N/Na, где Na - число Авагадро = 6,02^1023 (г/моль)
n=6.02*10^23/6.02*10^23=1(моль)
m=n*M
M(N2)=2*14=28(г/моль)
m=1*28=28(г)