A 5gm of sugar solution in 200 ml of water found to be isotonic With 2.1% solution of an unknown organic compound solution find out the molar mass of the unknown compound
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12th
Chemistry
Solutions
Colligative Properties and Determination of Molar Mass
A 6
CHEMISTRY
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Asked on December 27, 2019 by
Shamsher Sawant
A 6% solution of sucrose C
22
H
22
O
11
is isotonic with 3% solution of an unknown organic substance. The molecular weight of unknown organic substance will be:
MEDIUM
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ANSWER
∵6% sucrose solution is isotonic with 3% solution of unknown organic substance, thus,
or
CRT
(sucrose)
=CRT
(organic substance)
π
(sucrose)
−π
(organic substance)
or [
M×V
w
⋅RT]
(sucrose)
=[
M×V
w
⋅RT]
(organic substance)
or
342
6
=
M
(organic substance)
3
where, w
(sucrose)
=6
w
(organic substance)
=3
M
(sucrose)
=3
M
(organic substance)
=?
Hence, M
(organic substance)
=
6
3×342
∴ Molecular mass of unknown organic substance
=171.
*please give me the brailiest*..