2C2H6+7O2=4CO2+6H2O
n(O2)=1,4*7/2=4.9моль
V(O2)=4,9*22,4=109,76дм3
1. HNO3 = H(+) + NO3(-)
C(H+) = C(HNO3) = <span>0,0001 моль/л
pH = -lg H(+) = -lg </span><span>0,0001 =</span> 4
1. KOH = K(+) + OH(-)
C(OH-) = C(KOH) = <span>0,001 моль/л
pOH = -lg OH(-) = -lg </span>0,001 = 3
pH = 14 - <span>pOH =</span> 14 - 3 = 11
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Оксиды: 1, 3, 7.
гидриды: 2, 6.
лвс: 4, 5, 8, 9.