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0 g的HAc分别溶于100 g水和苯中，测得它们的冰点分别为272.836K和278.122K。已知水和苯的冰点分别为0和5.4 ℃，其凝固点下降常数为1.86和5.12K∙kg∙mol-1，试计算两溶液的质量摩尔浓度（保留三位有效数字，单位mol/kg），并说明它们间的差别（HAc的分子量为60）。
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