\(n_{Na}=\dfrac{2,3}{23}=0,1\left(mol\right)\\ a,PTHH:2Na+H_2SO_4\rightarrow Na_2SO_4+H_2\\ b,n_{Na_2SO_4}=n_{H_2}=n_{H_2SO_4}=\dfrac{0,1}{2}=0,05\left(mol\right)\\ m_{Na_2SO_4}=142.0,05=7,1\left(g\right)\\ c,C\%_{ddH_2SO_4}=\dfrac{0,05.98}{4,9}.100\%=100\%\)
Thường C% < 100% ớ em