8,5г xг
P2O5+3H2O=2H3PO4 х=196×8,5÷142=11,7г(H3PO4)
142г 196г
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8,5г xг
P2O5+3H2O=2H3PO4 х=196×8,5÷142=11,7г(H3PO4)
142г 196г