3NaOH+H3PO4___Na3PO4+ 3H2O
980×30:100=294
3•40___3+31+4•16
X____294
X=120•294:98
X=360
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3NaOH+H3PO4___Na3PO4+ 3H2O
980×30:100=294
3•40___3+31+4•16
X____294
X=120•294:98
X=360