# Chemistry

A certain substance has a heat of vaporation 56.21 kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 361k?

I need help in setting the problem:

I got 56.21/8.3145j/mol.k(1/T1-1/T2)?

1. 👍 0
2. 👎 0
3. 👁 56
1. Did you substitute into the Clausius-Clapeyron equation?
ln (p2/p1) = delta Hvap/R(1/T1 - 1/T2)
I would make up a number, like 1 for the vp at 361K. Then ln(6.5/1) = 56,210J/R(1/361 - 1/T2)
delta H vap must be in J/mol and not kJ/mol. You could have substituted p for p1 and 6.5p for p2 and you end up with 6.5/1 just as above.Solve for T2. R is 8.314

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### Chemistry

A certain substance has a heat of vaporation 56.21 kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 361k? Thank you

asked by Josh on July 9, 2011
2. ### Chemistry

A certain substance has a heat of vaporation 56.21 kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 361k? Thank you

asked by Josh on July 9, 2011
3. ### Chemistry

A certain substance has a heat of vaporation 56.21 kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 361k? Thank you

asked by Josh on July 9, 2011
4. ### Chemistry

A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?

asked by Josh on January 25, 2012
5. ### Chemistry

A certain substance has a heat of vaporization of 26.49 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 285 K?

asked by Nick Tanner on January 15, 2014
6. ### Urgent Chem Help

A certain substance has a heat of vaporization of 55.30 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.50 times higher than it was at 361 K?

asked by Carl on February 10, 2013
7. ### chemistry

A certain substance has a heat vaporization of 47.97 kJ/mol. At what Kelvin temperature will the vapor pressure be 7.50 times higher than it was at 297K? Please help me! I don't understand heat vaporization questions

asked by Angela on January 23, 2012
8. ### Chemistry

Consider the following properties of a particular substance: melting point: -7.2 degrees C boiling point: 58.8 degrees C heat of fusion: 10.571 kJ/mol specific heat of the solid: 87.4 J/mol degrees C specific heat of the gas: 40.0

asked by Ceamus Angelina on May 2, 2018
9. ### Chem 2

1.057 grams of a substance with a molar mass of 385.336 g/mol are dissolved in 249.92. Ther temperature for the system changes from 83.83 to 52.38 degrees C during the mixing. What is the DH(heat of solution) for this process in

asked by Amanda on February 27, 2008
10. ### Chemistry

A certain substance has a heat of vaporization of 62.08 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than it was at 361 K? I've gotten it to the point of: ln(4.50)=7466.47423176378616 K (1/361 -

asked by Anonymous on December 7, 2016

More Similar Questions