5 g of anhydrous strontium nitrate is added to a beaker and exposed to air. After several hours the beaker and the contents are weighed. It was found that the mass increased by 1.70 g. Assume that the increase in mass is totally due to the absorption of water by the anhydrous compound.  Hoe many moles of water were absorbed by the strontium nitrate?

Chemistry: An Atoms First Approach
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Chapter1: Chemical Foundations
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5 g of anhydrous strontium nitrate is added to a beaker and exposed to air. After several hours the beaker and the contents are weighed. It was found that the mass increased by 1.70 g. Assume that the increase in mass is totally due to the absorption of water by the anhydrous compound. 

Hoe many moles of water were absorbed by the strontium nitrate?

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