Question

12. When the vapor pressure of water is 30 kpa the temperature of the water is? A) 20 degrees celesius B) 100 degrees celesius C) 70 degrees celesius D) 40 degrees celesius

Answer 1

The vapour pressure of water is 30 kPa at C) 70 °C.

Explanation:

I am guessing that you are supposed to interpret a vapour pressure something like the one below.

(Adapted from Kent Chemistry)

You start at 30 kPa on the vertical axis.

Draw a line parallel to the horizontal axis until you reach the vapour pressure curve for water.

Then drop a line vertically to the temperature axis.

It hits the axis at 70 °C.

Thus, the vapour pressure of water is 30 kPa at 70 °C.