Đáp án:
Giải thích các bước giải:
nP = 6,2/31 = 0,2 mol
PTHH : 4P + 5O2 --to--> 2P2O5
Theo PT trên nO2 = 5/4 .nP = 0,2.5/4 = 0,25 mol
a. VO2 = 0,25.22,4 = 5,6 lít
b. nP2O5 = 1/2 .nP = 0,2/2 =0,1 mol
⇒ mP2O5 = 0,1.142 = 14,2 gam
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