Answer:
Mole fraction of alcohols in liquid phase
.
Mole fraction of alcohols in vapor phase
.
Explanation:
The total vapor pressure of the solution = p =38.6 Torr
Partial vapor pressure of the n-propyl alcohol =
Partial vapor pressure of the isopropyl alcohol =
(Raoult's Law)




is mole fraction in liquid phase.
Mole fraction of components in vapor phase 
(Dalton's law of partial pressure)




Mole fraction of alcohols in vapor phase 
B. examining the number of chromosomes in population
Explanation:
The driving force behind plate tectonics is convection in the mantle. Hot material near the Earth's core rises, and colder mantle rock sinks.
There are 6 molecules of Mg3(PO4)2
6 × 3 = 18 Mg
6 × 4 × 2 = 48 O