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An impure sample of silver (1.5g) is hea...

An impure sample of silver (1.5g) is heated with S to form 0.124 g of `Ag_(2)S`. What was the percent yield of `Ag_(2)S`?

A

`21.6%`

B

`7.2%`

C

`1.7%`

D

`24.8%`

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(2Ag , +, S , to , Ag_(2)S),(2,:,1,:,1):}`
mol of `Ag=(1.5)/(108)`
mol of `Ag_(2)S=(1.5)/(108) xx (1)/(2)`
wt. of `Ag_(2)S =(1.5)/(108) xx (1)/(2) xx (248)`
`=1.72` gm
% yield `=(0.124)/(1.72) xx 100`
`=7.2%`
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