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A sample of an unknown hydrated compound weighed 16.450 grams. After heating, it had a mass of 10.319 grams. Calculate the percentage of water by mass in the unknown.

Question

A sample of an unknown hydrated compound weighed 16.450 grams. After heating, it had a mass of 10.319 grams. Calculate the percentage of water by mass in the unknown.

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Step 1

We have to calculate the percentage of water by mass in the unknown hydrated compound that weighed 16.450 grams. After heating, sample had a mass of 10.319 grams.

Step 2

Calculate the mass of water in the sample of unknown hydrated compound-

On heating of hydrated compound, it loses all its water molecules.

Thus, Mass of water in sample = mass of hydrated compound – mass of heated compound.

Mass of water= 16.450 g - 10.319 g = 6.131 g
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Mass of water= 16.450 g - 10.319 g = 6.131 g

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Step 3

Therefore, mass of water = 6.131 g.

Now calculate the mass percenta...

Mass of water
Mass percentage of water
x100
Total mass of the hydrated compound
6.131 g
100 37.27%
16.450 g
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Mass of water Mass percentage of water x100 Total mass of the hydrated compound 6.131 g 100 37.27% 16.450 g

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