根据质量守恒,可知
1）生成CO2的质量=100g +14.4g-110g=4.4g
2)CaCO3 +2HCl=CaCl2 +CO2 +H2O
73 44
x 4.4g
x=7.3g
稀盐酸中溶质的质量分数=7.3g/100g*100%=7.3%