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2*mN + x*mO = 108u
2* 14u + x*16u = 108u
x* 16u = 108 - 28
x* 16u = 80u / 16u
x = 5
wzór zwiazku N₂O₅
b) C2Hx m.cz=30u
2*mC + x *mH = 30u
2 * 12u + x * 1u = 30u
x * 1u = 30u - 24u
x * 1u= 6u / 1u
x = 6
wzór związku C₂H₆
c) Fe2Ox m.cz=160u
2 * mFe + x * mO = 160u
2 * 56u + x * 16u = 160u
x * 16u = 160u - 112u
x * 16u = 48u / 16u
x = 3
wzór zwiazku Fe₂O₃
d) HxCO3 m.cz=62u
x *mH + mC + 3 * mO = 62u
x *1u + 12u + 3* 16u = 62u
x *1u = 62u - 12u - 48u
x *1u = 2 / 1u
x = 2
wzór zwiazku H₂CO₃