\(n_{CH_4}=\dfrac{m}{M}=0,3\left(mol\right)\)
\(CH_4+Cl_2\rightarrow CH_3Cl+HCl\)
.0,3....................0,3...........
\(\Rightarrow m_{CH3Cl}=n.M=15,15\left(g\right)\)
\(CH_4 + Cl_2 \xrightarrow{ánh\ sáng} CH_3Cl + HCl\\ n_{CH_3Cl} = n_{CH_4} = \dfrac{4,8}{16} = 0,3(mol)\\ \Rightarrow m_{CH_3Cl} = 0,3.50,5 = 15,15(gam)\)