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Calculate the number of millilitres at S...

Calculate the number of millilitres at STP of `H_(2)S` gas needed to precipitate cupric sulphide completely from 100mL of a solution containing 0.75 g of `CuCl_(2)` in 1L.

A

21.4

B

14.2

C

41.2

D

124

Text Solution

Verified by Experts

The correct Answer is:
D
`CuCl_(2)+H_(2)srarrCuS+2HCl`
Number of moles of `H_(2)S`=Number of moles of `CuCl_(2)`
`=(0.75)/(134.5)=0.00557`
Volume of `H_(2)S=0.00557xx22400=124.8mL`.
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