### Topic: Calotemitry problem  (Read 832 times)

0 Members and 1 Guest are viewing this topic.

#### Matchu

• Very New Member
• Posts: 2
• Mole Snacks: +0/-0
##### Calotemitry problem
« on: November 07, 2018, 10:42:22 PM »
A student conducts an experiment to determine the enthalpy of a solution for lithium chloride dissolved in water. The student combines 5 grams of lithium chloride with 100 ml of distilled water. The initial temperature of the water is 23°C and the highest the temperature after mixing reached was 33°C. Assume a density of 1 g/ml and a specific heat of 4.18. The calorimeter constant is 20. What is the energy change of the solution and calorimeter and what is the total ΛH of the solution in kJ/mol.

#### billnotgatez

• Global Moderator
• Sr. Member
• Posts: 3747
• Mole Snacks: +207/-55
• Gender:
##### Re: Calotemitry problem
« Reply #1 on: November 07, 2018, 11:40:10 PM »
You have to show your attempts or thoughts at solving the question to receive help.
This is a forum policy.
Click on the link near the top center of the forum page.
Forum Rules: Read This Before Posting.
http://www.chemicalforums.com/index.php?topic=65859.0

#### Matchu

• Very New Member
• Posts: 2
• Mole Snacks: +0/-0
##### Re: Calotemitry problem
« Reply #2 on: November 08, 2018, 08:15:43 AM »
Oh, oops sorry I'm new and must not have seen that. So far on this question I have tried using the ΛH=mcpΛT formula by plugging in change in temperature, mass, and the specific heat to get .4389 kJ. But, I am unsure on where to go from there.

#### mjc123

• Chemist
• Sr. Member
• Posts: 1533
• Mole Snacks: +220/-9
##### Re: Calotemitry problem
« Reply #3 on: November 08, 2018, 11:25:40 AM »
Show your working, so we can see where you went wrong (yes, it's wrong).
What is the sign of ΔH? (BTW, not ΛH)