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xg azotu------7
x=108*7/27
x=28g azotu
n=m/M
n=28/14
n=2 mole azotu
108g----------27 (7 + 20)
xg tlenu------20
x=108*2/27
x=80g tlenu
n=m/M
n=80/16
n=5 moli tlenu
Wzór naszego związku to N2O5 (tlenek azotu(V))