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mC28=28*12u=336u
mC70=70*12u=840u
mC28= 12u * 28 = 336 u
mC70 = 12u * 70 = 840 u
C70 = 12*70 = 840g
jezeli zalozymy ze mamy do czynienia z 1mole.
m=n*M.