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calculati masa de heliu ocupata de 30,11×10²³ atomi de heliu​

Răspuns :

Răspuns:

MHe=4g/mol

4g He.......6,022x10²³ atomi He

yg He.......30,11x10²³ atomi He

y=4×.30,11x10²³/6,022×10²³=20g He