Question

prelecture ch 12 Chapter 12 Multiple Question 38 prevous Chapter 12 Multiple Question 38 Part A of 387 kJimo. Determine the vapor pressure (in mm Hg) of a substance at 29 C, whose normal boling point is 76-C and has a 솨, O 21 mm Hg O 48 mm Hg 13 mm Hg O 80 mm Hg O 96 mm Hg Submit My Answers Give Up Incorrect: Try Again; 2 attempts remaining Con

Answer 1

ln (P2/P1) = -( $\Delta$ $\Delta \Delta$ H/R) (1/T2-1/T1)

R has units of J/mol K, and so you'll either need to convert the Hvap into J/mol or R into kJ/mol (I think the first one is easier.

Now, the ln issue...Once you calculate the entire right side of the equation, you'll have

ln (760 / P2) = ______

To get rid of the ln, you will raise e to the power of the right side (Take the inverse natural log of the right side.