Chemistry Help with Hydrates
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Chemistry Help with Hydrates

[From: ] [author: ] [Date: 12-12-23] [Hit: ]
what is the formula of the hydrate? Use Lab Group 1s results.mass before heating = 1.mass after heating = 1.Please help me understand how to work this.-1.......
Here is the question: If, after heating, the solid has a molar mass of 201 g/mol and a formula of XY, what is the formula of the hydrate? Use Lab Group 1's results.

Here are the group's results:
mass before heating = 1.48g
mass after heating = 1.26g

Please help me understand how to work this.

-
1.48 - 1.26 = 0.22 g

0.22 g / 18.015 g/mol = 0.012212 mol (of water in the hydrate)

1.26 g / 201 g/mol = 0.0062686 mol (of the anhydrate)

What we want to know is the smallest whole-number ratio of water to anhydrate:

0.012212 mol / 0.0062686 mol = 1.948

Within experimental error, 1.948 equals 2 waters of hydration:

XY · 2H2O
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