V(CO2) = c ml所以n(CO2) = (c/1000)/22.4 = c/22400 mol由于CO2全部由Na2CO3生成，所以n(Na2CO3) = n(CO2) = c/22400 mol所以m(Na2CO3) = 106 * c/22400 = 53c/11200 g所以该样品中NaCO3的质量分数 = (53c/11200)/M * 100% = 53c/(11200M)
