# Homework Help: Can someone check my work! (Hvap/Hcond Calculation)

1. Dec 12, 2017

### Lori

1. The problem statement, all variables and given/known data
I don't have an answer key to these questions and it's my first time dealing with problems like this. so was wondering if my process is correct!

2. Relevant equations
q = m*deltaT*C
q = mols*Hvap

3. The attempt at a solution
So, my reasoning behind this work is that there was heat released from cooling and also heat from condensation. So, i found heat from cooling from the equation q = mdeltaTC = 2.53 J/gC * 30g * 9.5 = 721.05 joules = 0.72105 KJ. The heat heat from vaporization is just mols*Hvap = 48.221 KJ

Added together = 48.221 KJ. Was wondering if this is correct?

2. Dec 13, 2017

### Staff: Mentor

Logic behind looks OK, but why 30 g?

3. Dec 13, 2017

### Lori

i converted the 1.25 mol to mass with MM. is this correct?

4. Dec 13, 2017

### Staff: Mentor

And what is molar mass of methanol?

5. Dec 13, 2017

### Lori

Gotcha. Plugged it into calculator. Should be 40 grams