1) \(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Gọi kim loại cần tìm là M
PTHH: \(M_2CO_3+2HCl\rightarrow2MCl+CO_2+H_2O\)
0,3<------0,6<-------0,6<------0,3
`=>` \(M_{M_2CO_3}=\dfrac{31,8}{0,3}=106\left(g/mol\right)\)
`=>` \(M_M=\dfrac{106-60}{2}=23\left(g/mol\right)\)
`=> M: Na(Natri)`
2) \(m_{ddHCl}=\dfrac{0,6.36,5}{14,6\%}=150\left(g\right)\)
3) \(m_{ddspư}=31,8+150-0,3.44=168,6\left(g\right)\)
`=>` \(C\%_{NaCl}=\dfrac{0,6.36,5}{168,6}.100\%=20,82\%\)