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Cate grame contin 5 moli de CH4?
Va rog e urgent , dau test azi si chiar am nevoie!


Răspuns :

n=m/M......n=nr de moli, m=masa, M=masa molara sau masa moleculara.

CH4 are M=16,04 astfel:
    Mch4=masa carbon(12,04)+4*masa hidrogen(1)
            = 12,04+4*1=16,04 g/mol
n=m/M=> 5moli=m/16,04=> m=16,04*5=> m=80,2gCH4