pthh:
\(CaCO_3\underrightarrow{t^o}CaO+CO_2\left(1\right)\)
\(0,15\leftarrow\)----------------0,15 (mol)
\(CaO+2HCl\rightarrow CaCl_2+H_2O\left(2\right)\)
\(0,15\leftarrow\)---0,3 (mol)
\(nHCl=0,3.1=0,3\left(mol\right)\)
pt (2) \(\Rightarrow nCaO=\dfrac{1}{2}.nHCl=\dfrac{1}{2}.0,3=0,15\left(mol\right)\)
pt(1) \(\Rightarrow nCaCO_3=nCaO=0,15\left(mol\right)\)
\(\Rightarrow mCaCO_3=0,15.100=15\left(g\right)\)