1.
дано
n(P)=1.6 mol
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n(O2)-?
m(O2)-?
1.6 Xg
4P + 5O2-->2P2O5 M(P)=31 g/mol M(O2) = 32g/mol
4*31 5*32
X=1.6*160 / 124 = 2.07 g
n(O2)=m/M = 2.07/32 = 0.065 mol
ответ 0.065 моль, 2.07 г
2NaNO3-->2NaNO2+O2
Ca+2C-->CaC2
2Al+3H2SO4-->Al2(SO4)3+3H2
Ca(OH)2+2HNO3-->Ca(NO3)2+2HNO3