MHBr1=65*0.8=52g
mHBr2=50*0.4=20g
m(r-ra)3=65+50=115g
mHBr3=50+20=72g
wHBr=72/115*100=65.2\%
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2Fe+O2=2FeO
<span>Na+O2=2NaO</span>
Ca3(PO4)2->P->P2O5->H3PO4->Na3PO4
Ca3(PO4)2+5 C+3 SiO2 = 2 P+3 CaSiO3+5 CO
4 P+5 O2 = 2 P2O5
P2O5+3 H2O = 2 H3PO4
H3PO4 + 3 NaOH = Na3PO4 + 3 H2O