EASY CHEMISTRY QUESTION! PLEASE HELP

Chemistry
Tutor: None Selected Time limit: 1 Day

The vapor pressure of SiCl4 is 100mmHg at 5.4*C, and the normal boiling point is 56.8*C

What is deltaHvap for SiCl4 in kJ/mol?



Feb 10th, 2015

Ln(P2/P1) = (DH/R)*(1/T1-1/T2) . . . . . .(1)
where DH reads Delta H, and is the Hvap you are looking for when P1=100, P2=760, T1=278.6, and T2=330. Put in every thing we get:
Hvap = R*Ln(P2/P1)/(1/T1-1/T2)
= 8.314*Ln(760/100)/(1/278.6-1/330)
= 30.2 (kJ/mol)


Feb 10th, 2015

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