1个Na2CO3分子由2个Na原子、1个C原子和3个O原子组成,
Na的原子量为23,
C的原子量为12,
O的原子量为16,
所以Na2CO3的分子量为
2×23＋1×12＋3×16＝106,
1摩尔碳酸钠的质量为106克,
则1.5摩尔碳酸钠的质量为1.5×106＝159克
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