Cau 1
Ta co pthh : 2H2 + O2-t0\(\rightarrow\) 2H2O
Theo de bai ta co
nH2=\(\dfrac{4}{22,4}\approx0,18mol\)
Theo pthh
nO2=\(\dfrac{1}{2}nH2=\dfrac{1}{2}.0,18=0,09mol\)
\(\Rightarrow\) VO2=0,09.22,4=2,016l
Cau 2
Ta co pthh
2H2 + O2-t0\(\rightarrow\) 2H2O
Theo de bai ta co
nO2=\(\dfrac{16}{32}=0,5mol\)
Theo pthh
nH2=2nO2=2.0,5=1mol
\(\Rightarrow\) mH2=1.2=2 g
1) nH2=V/22,4=4/22,4\(\approx0,18\left(mol\right)\)
PT:
2H2 + O2 \(\underrightarrow{t^0}\) 2H2O
cứ: 2.............1.............2 (mol)
Vậy:0,18 -> 0,09 -> 0,18 (mol)
=>VO2=n.22,2=0,09.22,4=2,016(lít)
2) nO2=m/M=16/32=0,5(mol)
Ta có PT:
2H2 + O2 \(\underrightarrow{t^0}\) 2H2O
cứ: 2..........1............2 (mol)
Vậy: 1 <- 0,5 -> 1 (mol)
=>mH2=n.M=1.2=2(g)
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