16. One mole of a sample of hydrated sodium sulphide contains 162g of water of crystallisation. What is the correct formula of this compound?
A. Na S.3H0
B. Na S.5H2O
C. Na S.7H20
D. Na S.9H20
Answers
Answered by
2
Answer:
option (A) - Na S.3H0
Explanation:
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Answered by
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Given: One mole of a sample of hydrated sodium sulphide contains 162g of water of crystallisation.
To find: We have to find the formula of the compound.
Solution:
The chemical formula of sodium sulphide is NaS.
It contains 162g of water of crystallisation.
Now we know that molecular weight of 1 mole of water is 18 gram.
So, 162 gram will contain 162/18=9 moles of water.
Thus the compound contains 9 moles of water.
The formula of the compound is .
The correct option is D .
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