At a particular temperature, vapour pressure of a solution containing 5g non-electrolytic solute dissolved in 100 g water, is 2985 Nm. If vapour pressure of pure water at same temperature is 3000 Nm-² then calculate the molecular mass of solute.
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>>The vapour pressure of solution of 5g
The vapour pressure of solution of 5g of non electrolyte in 100 g of a water at a particular temperature is 2985Nm
−2
. The vapour pressure of pure water at that temperature is 3000Nm
−2
Medium
Mole fraction of solute, x
2
=
p
1
∗
−Δp
=
3000
3000−2985
=0.005
Now, x
2
=
M
1
m
1
+
M
2
m
2
m
2
/M
2
≈
m
1
/M
1
m
2
/M
2
∴0.005=
100/18
5/M
2
⇒M
2
=180gmol
−1
∴ The molar mass of solute is 180gmol
−1
Verified answer
Answer:
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Explanation:
The circumference of the base of a cone is 44 cm and the sum of its radius and slanting height is 32 cm.Find total surface area.
a. 44 cm²
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