\(PTHH:CaCO_3+2HCl\rightarrow CaCl_2+CO_2\uparrow+H_2O\\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: CaSO_4+2HCl\rightarrow CaCl_2+H_2SO_4\)
\(n_{CO_2}=\dfrac{0,448}{22,4}=0,02\:mol\)
\(\Rightarrow m_{CaCO_3}=0,02.100=2g\)
\(\Rightarrow m_{CaSO_4}=5-2=3g\)
\(\Rightarrow n_{CaSO_4}=\dfrac{3}{136}\:mol\)
\(\Rightarrow n_{HCl}=\dfrac{3}{136}+0,02=\dfrac{143}{3400}\:mol\)
\(\Rightarrow C_{M\:dd\:HCl}=\dfrac{\dfrac{143}{3400}}{0,2}=\dfrac{143}{680}\approx0,21M\)\(\%m_{CaCO_3}=\dfrac{2}{5}.100\%=40\%\\ \Rightarrow\%m_{CaSO_4}=100\%-40\%=60\%\)
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