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The volume of ethyl alcohol (density 1.1...

The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is

A

1.15 cc

B

2 cc

C

2.15 cc

D

2.30 cc

Text Solution

Verified by Experts

The correct Answer is:
B
100 cc of 0.5 M ethyl alcohol
`-= 100 xx 0.5 xx 10^(-3)` mole `=5 xx 10^(-2)` mole
`therefore` Weight of ethyl alcohol required
`=5 xx 10^(-2) xx 46 g = 2.3 g` [`therefore` Molecular weight of ethyl alcohol = 46]
`therefore d=("Mass")/("Volume") rArr 1.15 = 2.3/V rArr V = 2.30/1.15` =2
`therefore` Volume required =2cc
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