(b) Surface sanitizers were prepared using ethyl alcohol/water and isopropyl alcohol/water solutions. An experiment was

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(b) Surface sanitizers were prepared using ethyl alcohol/water
and isopropyl alcohol/water solutions. An experiment was done to
determine which composition would be most effective and as such two
solutions were formulated: 70 % v/v ethyl alcohol and 70 % v/v
isopropyl alcohol. Calculate the vapour pressure of these solutions
and use your answer to reason which combination would stay on the
surface longer.
P o (Ethyl alcohol) = 12.4 kPa
P o (Isopropyl alcohol) = 4.4 kPa
P o (Water) = 2.4 kPa