Relationship of vapour pressure and Dew Point

[miniradman]

Homework Statement

Moist air at 32 degrees C has a dew point of 26 degrees C. The total or atmospheric pressure
is 100.7kPa.

find the:
Molal Humidity
Relative Humidity

Homework Equations

Molal Humidity = \frac{P_{i}}{P_{tot} - P_{i}}
Relative Humidity = \frac{P_{i}}{P_{vap}}

The Attempt at a Solution

I'm thinking I can simply sub in the vapour pressure for the dew point (looking at a pressure table) straight in as the partial pressure for molal humidity.

I got an answer of 3.45%, using equation for molal humidity. I have no answers for this particular question, so I'm not sure if this is correct.

 

[Chestermiller]

Homework Statement

Moist air at 32 degrees C has a dew point of 26 degrees C. The total or atmospheric pressure
is 100.7kPa.

find the:
Molal Humidity
Relative Humidity

Homework Equations

Molal Humidity = \frac{P_{i}}{P_{tot} - P_{i}}
Relative Humidity = \frac{P_{i}}{P_{vap}}

The Attempt at a Solution

I'm thinking I can simply sub in the vapour pressure for the dew point (looking at a pressure table) straight in as the partial pressure for molal humidity.

I got an answer of 3.45%, using equation for molal humidity. I have no answers for this particular question, so I'm not sure if this is correct.

Looks correct.

Chet