Ответ:
P2O5 + 3H2O = 2H3PO4
27:142 = x:196;
x = (27*196):142 = 37.27 гр
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Ответ:
P2O5 + 3H2O = 2H3PO4
27:142 = x:196;
x = (27*196):142 = 37.27 гр