What is the vapor pressure of water?

Question

If the relative humidity is 22.0 and the partial pressure of water is 5.24 mm hg, what is the vapor pressure of water in mm hg?

a- 1.15

b- 5.24

c- 11.5

d- 23.8

e- 31.8

Answer 1

its a because using the equation hdg for pressure we get

pressure= hdg

              = 22.0*5.24

              = 1.15 correct to 1 decimal place