\(\dfrac{m_{H2}}{m_{O2}}=\dfrac{1}{4}=x\)
=>mH2=x(g)->nH2=\(\dfrac{x}{2}\left(mol\right)\)
mO2=4x(g)->nO2=\(\dfrac{4x}{32}=\dfrac{x}{8}\left(mol\right)\)
PTHH: 2H2 + O2 \(\underrightarrow{t^o}\) 2H2O
xét : \(\dfrac{x}{4}>\dfrac{x}{8}\)=> H2 dư, O2 hết
nH2(dư)=\(\dfrac{x}{2}-\dfrac{x}{4}=\dfrac{x}{4}\)=3.36:22,4=0,15(mol)
=>x=0,15.4=0,6
nO2=0,6:8=0,075(mol)
NH2=0,6:2=0,3(mol)
VA(đktc)=22,4(0,3+0,075)=8,4(lít)
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