2. When determining the content of crystallization moisture in iron nitrate Fe(NO3)3. 9H2O obtained the following results:
The mass of an empty bottle is 25.7823 g.
The weight of the bottle with a sample is 26.7823 g.
The weight of the bottle with a sample after drying is 26.5945 g.
Calculate the theoretical moisture content of the sample, the moisture content of the sample, and the relative experimental error.

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