\(N{a_2}C{O_3}\,+ \,2HCl\,\to \,2NaCl\,+ \,C{O_2}+ \,{H_2}O\)
1 mol 2 mol 2 mol 1 mol
?mol ?mol ? mol 0,02 mol
\({n_{khí}} = {n_{C{O_2}}} = \dfrac{{0,448}}{{22,4}} = 0,02(mol);{n_{HCl}} = \dfrac{{0,02 \times 2}}{{1}} = 0,04(mol)\)
a) \({C_M} = \dfrac{{n}}{{V}} = \dfrac{{0,04}}{{0,02}} = 2(M)\)
b) \({n_{NaCl}} = \dfrac{{0,02 \times 2}}{{1}} = 0,04(mol) \to {m_{NaCl}} = n.M = 0,04.58,5 = 2,34(g)\)
c) \({n_{N{a_2}C{O_3}}} = \dfrac{{0,02 \times 1}}{{1}} = 0,02(mol) \to {m_{N{a_2}C{O_3}}} = n.M = 0,02.106 = 2,12(g)\)
\(\% {m_{N{a_2}C{O_3}}} = \dfrac{{2,12}}{{5}} \times 100\% = 42,4\% \)
\(\% {m_{NaCl}} = 100\% - 42,4\% = 57,6\% \)
