Air at 293 k and 750 mm hg pressure has a relative humidity of 80%. what is its percent humidity? the vapour pressure of water at 293 k is 17.5 mm hg. (a) 80.38 (b) 80 (c) 79.62 (d) 78.51

Answer : The correct option is, (c) 79.62

Explanation :

The formula used for percent humidity is:

  ..........(1)

The formula used for relative humidity is:

      ...........(2)

where,

= partial pressure of water vapor

= vapor pressure of water

p = total pressure

First we have to calculate the partial pressure of water vapor by using equation 2.

Given:

Relative humidity = 80 % = 0.80

Now put all the given values in equation 2, we get:

Now we have to calculate the percent humidity by using equation 1.

Therefore, the percent humidity is 79.62 %

it would be d. henry moseley

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