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Ответ:

P2O5

W(P) = 43,7%

W(O) = 56,3%

H3PO4

W(H) = 3%

W(P) = 31,6%

W(O) = 65,4

Объяснение:

Mr(P2O5) = 31*2+15*5 = 142

W(P) = 31*2/142*100% = 43,7%

W(O) = 100%-43,7% = 56,3%

Mr(H3PO4) = 1*3+31+16*4 = 98

W(H) = 1*3/98*100% = 3%

W(P) = 31/98*100% = 31,6%

W(O) = 100%-(3%+31,6%) = 65,4