reweighing
那么如果你称量整个晶体的重量，你再测量热容，你知道有多少摩尔，现在你知道重量，你能计算出分子的重量。
So if you just weigh the whole crystal, and then you measure the heat capacity, you know how many moles there are, and now you know the weight, you can figure out the molecular weight.
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