Posted by **Dina** on Thursday, December 3, 2009 at 11:05pm.

Can anyone help me with these Chemistry questions? I am trying to study for an upcoming test and its just not sinking in as well and I thought.

This is Thermochem for a heads up:

Suppose 33mL of 1.20M HCl is added to 42mL of a solution containing excess sodium hydroxide in a coffee-cup calorimeter. The solution temperature, originallu 25.0 degrees celcius, riases to 31.8 degrees C. Give the enthaply change for the reaction

HCl(aq) + NaOH(aq) -> NaCl(aq) + H20 (l)

Express the answer as a thermochemical equation. For simplicity, assume that the heat capcity and the density of the final solution in the cup are thoe of water. Also assume that the total volume of the solution equals the sum of the volumes HCl and NaOH.

The answers is -54kJ... but how?

Next...

What will the final temperature of a mixture made from 25.0 g of water at 15 degrees C, 45 g of water from 50 degrees C, and from 15 g of water at 37 degrees C?

Answer is 34.7 degrees C.

## Answer this Question

## Related Questions

- chemistry - Hey, I was just wondering if anyone has previous chma11 term tests, ...
- Tips Plz - Can you plz tell me some studying tips for math. How can i study math...
- Writing equations from a table - Hiiii! My teacher gave out some practice ...
- Writing equations from a table - Hiiii! My teacher gave out some practice ...
- Need Preperation Help - I have a test on Hamlet soon and I'm just wondering if ...
- Math - The following are the last two problems on my test review. I am trying to...
- Chemistry - Our professor just told us that the final exam will be the ACS exam...
- Chemistry - Our professor just told us that the final exam will be the ACS exam...
- Science study skills - What is the importance of questioning in the SQ3R system...
- 7th Grade Math - I got a math test coming up on Friday, and i need help on ...

More Related Questions