Bài 2:
\(m_{CH_4}=0,3\times16=4,8\left(g\right)\)
CH4 + 2O2 \(\underrightarrow{to}\) CO2 + 2H2O
Theo ĐL BTKL ta có:
\(m_{CH_4}+m_{O_2}=m_{CO_2}+m_{H_2O}\)
\(\Leftrightarrow4,8+m_{O_2}=13,2+10,8\)
\(\Leftrightarrow m_{O_2}=13,2+10,8-4,8=19,2\left(g\right)\)
\(\Rightarrow n_{O_2}=\dfrac{19,2}{32}=0,6\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,6\times22,4=13,44\left(l\right)\)
\(\Rightarrow V_{KK}=13,44\times5=67,2\left(l\right)\)