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Answer to Question #3093 in Inorganic Chemistry for sweet

Question #3093
13.4 g of a sample of unstable hydrated salt: Na2SO4. xH20 was found to contain 6.3g of water. Determine the number of water of crystallization
Expert's answer
The molar mass of the salt is m(Na2SO4* xH2O) = 2*23+32+16*4 + x (2 + 16) = 142 + x*18 [g/mol]
Then let's construct the proportion:
13.4 / 6.3 = (142 + 18x)/18x
13.4 * 18x = (142 + 18x) * 6.3
241.2x = 894.6 + 113.4x
127.8x = 894.6
x = 7

Na2SO4* 7H2O

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Comments

Assignment Expert
18.11.14, 16:45

Dear Madhav,

You're welcome. We are glad to be helpful.
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Madhav
17.11.14, 17:58

Thank you sir. This will really help me

Assignment Expert
17.11.14, 16:32

It is formed by fact that we know the total mass of compound and how much water it contains. Then it is clear the proportion of water mass in compound to the total mass will be the same as the ratio of molar mass of water to the total molar mass of compound.

madhav
15.11.14, 15:13

Pls tell how is this proportion formed

Assignment Expert
29.09.14, 15:09

You're welcome. We are glad to be helpful. 
If you liked our service please press like-button beside answer field. Thank you!

Nishant
28.09.14, 19:27

Thanks... I needed that.

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