35g of ethylene glycol isadded in 1kg of water so that resulting solution freeze sat- 10°C if Kf for water is1.86k/m.find molecular mass of compound.
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Answer:
What mass of ethylene glycol (Molar mass =62.0g mol
−1
) must be added to 5.50 kg of water to lower the freezing point of water from 0
o
C to - 10
o
C ? (K
f
for water =1.86 K Kg mol
−1
)
ΔT
f
=K
f
×m
m=
M
B
W
B
×
W
A
1000
10=1.86×
62
W
B
×
5500
1000
W
B
=1833.3gm
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