The normal boiling point of methanol is 64.7°C. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 713.8 torr at 64.7°C. What is the mole fraction of methanol in this solution?

x = 0.94

Explanation:

From Raoult´s law of partial pressure in solution we know

P methanol = X methanol Pº methanol

where P methanol is the partial pressure of methanol in solution, X is the mole fraction of methanol and Pº is its pure vapor pressure.

Given the equation above we can solve for X , mole fraction:

X methanol = P methanol / Pº methanol = 713.8 torr / 760 torr

( key here is that the normal boiling point is defined as the temperature at which a substance boil at one atmosphere pressure (760 torr) which was stated in the question)

X methanol = 0.94

Explanation:

Below is an attachment containing the solution.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

distance, luminosity, brightness, radius, chemical composition, and temperature