Ответы на вопрос:
P+ o2 = p2o5 p2o5 + 3h2o = 2h3po4 n(p2o5) = 0,5n(h3po4) = 0,5*4,9/98=0.025n(p) = n(p2o5) = 0.025m(p) =31*0.025=0.775
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