M(P2O5) = 31*2+16*5 = 142
M(H3PO4) = 1*3 + 31 + 16*4 = 98
M(N2O5) = 14*2+16*5 = 108
M(SO3) = 32+16*3 = 80
Cамая тяжёлая - P2O5
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M(P2O5) = 31*2+16*5 = 142
M(H3PO4) = 1*3 + 31 + 16*4 = 98
M(N2O5) = 14*2+16*5 = 108
M(SO3) = 32+16*3 = 80
Cамая тяжёлая - P2O5