October 23, 2016

Homework Help: Chem- Dr bob! or GK!

Posted by Rachelle on Saturday, November 29, 2008 at 11:04pm.

Calculate the energy that must be removed to convert substance X from a gas at 116C to a solid -44.6C. Assume X has a molar mass of 75.0 g/mol.

Hvap 20. kJ/mol
C(s) 3.0 J/gC
Hfus 5.0 kJ/mol
C(l) 2.5 J/gC
bp 75C
C(g) 1.0 J/gC
mp -15C

please help! what formulas do i use?

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