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Understanding Weather Reports

State whether...

Question

State whether true or false:
Dew point is the temperature at which the gas at given atmospheric conditions becomes saturated.

A

True

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B

False

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Solution

The correct option is A True
The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same rate at which it evaporates so dew point is a temperature at which the air becomes saturated.

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Q. The moisture content of a gas is often expressed in terms of the dew point. The dew point is the temperature to which the gas must be cooled before the gas becomes saturated with water vapour. At this temperature, water or ice (depending on the temperature) will be deposited on a solid surface. Dew point of

H_{2} O

- 43^{0} C

at which vapour pressure of ice formed is

0.07 m m

. Assuming that the

C a C l_{2}

owes its desiccating properties to the formation of

C a C l_{2} \cdot 2 H_{2} O

, calculate :
(i)

K_{p}

at that temperature of the reaction,
(ii)

Δ G

C a C l_{2} (s) + 2 H_{2} O (g) ⇌ C a C l_{2} \cdot 2 H_{2} O (s)

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