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A 10.0 g sample of a mixture of CaCl2 an...

A 10.0 g sample of a mixture of `CaCl_2` and `NaCl` is treated to precipitate all the calcium as calcium carbonate. Thus `CaCO_3` is heated to convert all the Ca to CaO and the final mass of CaO is 1.62 g. What is the percentage by mass of `CaCl_2` in the original mixture?

A

`15.2%`

B

`32.1%`

C

`21.8%`

D

`11.07%`

Text Solution

Verified by Experts

The correct Answer is:
B
Moles of `CaO = (1.62)/(56) rArr " Moles of "CaCl_(2) = (1.62)/(56)`
`rArr` Mass of `CaCl_(2) = (1.62)/(5) xx 111 = 3.21 gm rArr % = (3.21)/(10) xx 100 = 32.1 %`
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