n(p2o5)=m(p2o5)/M(p2o5)=35/142=0.25моль
N(p2o5)=n(p2o5)*Na=0.25*6.02*10^23=1.505*10^23частиц
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n(p2o5)=m(p2o5)/M(p2o5)=35/142=0.25моль
N(p2o5)=n(p2o5)*Na=0.25*6.02*10^23=1.505*10^23частиц