Hey I am problems with answering problems 1& 2. Can you pease show me how you go
ID: 474992 • Letter: H
Question
Hey I am problems with answering problems 1& 2. Can you pease show me how you got your answers please?1 points Save Answer QUESTION 1 Determine if each of the following will increase, decrease, or have no effect on the equilibrium vapor pressure of a substance? Increased volume of liquid A. Decreased vapor pressure increased Surface area of liquid B. No effect G increased temperature C. Increased vapor pressure QUESTION 2 1 points Save Answer A substance has a vapor pressure of 0.127 atm at 307 K. What is the normal boiling point of the substance in kelvin? Normal boiling is when vapor pressure 1 atm or 760 mmHg. vap 12.3 kJ/mol
Explanation / Answer
Increased volume of liquid - No effect
Increases surface area of liquid - No effect
Increased temperature - Increased vapor pressure
2) we use the formula
ln ( P2/P1) = ( dH / R) ( 1/T1 - 1/T2)
where P1 = initial vapo pressure = 0.127 , T1 = 307 K
P2 = 1 atm , T2 = normal boiling point which we find out
dH Vap = 12.3 KJ/mol = 12300 J/mol
ln ( 1 / 0.127) = ( 12300 J/mol / 8.314 J/molk) ( 1/307 - 1/T2)
T2 = 537 K
Thus noral boiling point is 537 K