# 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
1
2011-06-09T10:14:32-0400
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&#039;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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Assignment Expert
18.11.14, 16:45

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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.

15.11.14, 15:13

Pls tell how is this proportion formed

Assignment Expert
29.09.14, 15:09

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Nishant
28.09.14, 19:27

Thanks... I needed that.