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aflati cate grame si cate molecule contin 5 moli de CH4

Răspuns :

MCH4=16g/mol
n=m/M==>m=n*M=5*16=80g CH4
1mol CH4...........6.022*10^23 molecule
5mol.................x=30.11*10^23 molecule=3011*10^21 molecule