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Cortisone is a molecular substance subst...

Cortisone is a molecular substance substance containing `21` atoms of carbon per molecule. The mas percentage of carbon in cortisone is `69.98%`. Its molar mass is :

A

`176.5`

B

`252.2`

C

`287.6`

D

`360.1`

Text Solution

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The correct Answer is:
D
`wt` of carbon `=21xx12 g`
`because 69.98 g` carbon contain `100 g` cortisone
`therefore 1 g` carbon contain `100 g `cortisone
`=(100)/(69.98)`
`therefore 21 xx 12 g rarr =(100)/(69.98)xx21xx12=360.10`
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