Posted by **Alex** on Thursday, March 8, 2012 at 6:40pm.

Given the data below, calculate the total heat (in J) needed to convert 20.0 g of liquid ethanol (C2H5OH) at 40.0 oC to gaseous ethanol at 125 oC.

A. 3.23 x 103 B. 3.67 x 103 C. 4.17 x 103 D. 2.08x104 E. 2.12 x 104

- Chemistry -
**DrBob222**, Thursday, March 8, 2012 at 6:51pm
It would have helped to give the data below. Here is how you do the problem.

I assume there is a density. Use the density to calculate the mass. mass -= volume x density.

Then for heat used there are two formula to use.

Within a phase you use

mass x specific heat x (Tfinal-Tinitial)

For example, for liquid ethanol between the freezing point and boiling point you will use

mass ethanol x specific heat ethanol x (b.p. temp - freezing point temp).

Then for the change of phase use

mass ethanol x heat fusion at the melting/freezing point or

mass ethanol x heat vaporization at the boiling point.

Then add all of the heats together for the total.

Post your work if you get stuck.

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