1.

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?

Answer»

`44`
`200`
`150`
`50`

Solution :`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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