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x' grams of calcium carbonate was comple...

x' grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. what is the value of 'x' in grams?

A

`44`

B

`200`

C

`150`

D

`50`

Text Solution

Verified by Experts

The correct Answer is:
D
`underset(=100g)underset(1mol)(CaCO_(3))overset(Delta)(to)underset(=56g)underset(=40+16)underset(1mol)(CaO)+CO_(2)`
To produce 56 g of residue (CaO),`CaCO_(3)` needed = 100 g
`:.` To produce 28 g of redue, `CaCO_(3)` needed
`=(100)/(56)xx28=50g`
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