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A 5% solution of glucose ( molar mass =1...

A 5% solution of glucose ( molar mass `=180` ) is isotonic with a 2.5% solution of a substance X at the same temperature. The molar mass of X is :

A

90

B

45

C

180

D

360

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Verified by Experts

The correct Answer is:
A
The two solution will have same osmotic pressure so that
`(5)/(180)RT=(2.5)/(M) RT` or `M=(2.5)/(5)xx180=90`
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