\(a.\)
\(n_{O_2}=\dfrac{0.15\cdot N}{N}=0.15\left(mol\right)\)
\(m_{O_2}=0.15\cdot32=48\left(g\right)\)
\(V_{O_2}=0.15\cdot22.4=3.36\left(l\right)\)
\(b.\)
\(n_{CO_2}=\dfrac{1.44\cdot10^{23}}{6\cdot10^{23}}=0.24\left(mol\right)\)
\(m_{CO_2}=0.24\cdot44=10.56\left(g\right)\)
\(V_{CO_2}=0.24\cdot22.4=5.376\left(l\right)\)
\(c.\)
\(m_{H_2}=0.25\cdot2=0.5\left(g\right)\)
\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)
\(d.\)
\(m_{CH_4}=1.5\cdot16=24\left(g\right)\)
\(V_{CH_4}=1.5\cdot22.4=33.6\left(l\right)\)
\(e.\)
\(n_{CO_2}=\dfrac{8.8}{44}=0.2\left(mol\right)\)
\(V_{CO_2}=0.2\cdot22.4=4.48\left(l\right)\)