\(Cl_2+2NaBr\rightarrow2NaCl+Br_2\)
\(n_{Cl2}=\frac{6,72}{22,4}=0,3\left(mol\right)\)
\(n_{NaBr}=0,4.2=0,8\left(mol\right)\)
\(\Rightarrow n_{NaBr}=0,8-0,3.2=0,2\left(mol\right)\)
\(n_{NaCl}=0,3.2=0,6\left(mol\right)\)
\(\Rightarrow m=m_{NaBr}+m_{NaCl}=0,2.103+0,6.58,5=55,7\left(g\right)\)
nCl2=6,72\22,4=0,3 mol
nNaBr=0,8 mol
2NaBr+Cl2-->2NaCl+Br2
0,8\2=0,3
==>NaBrdư
=>mNaCl=0,3.58,5=17,55 g
=>mNaBr dư=0,1.103=10,3 g
=>mhh muối =17,55+51,5=27,85 g