Homework Help: Chemistry Help(Calorimetry)

Posted by Bonn on Friday, April 9, 2010 at 1:37am.

I have a few questions to ask, since I was absent from school and I do not really understand the calorimetry problems.

1) When a 16.9 g sample of NaOH dissolves in 70.0 g of water in a calorimeter, the temperature rises from 22.4*C to 86.6*C. Calculate for Delta H for the process NaOH(s) -> Na(aq) + OH(aq)

2) A 2.5 g sample of zinc is heated, then placed in a calorimeter containing 65.0 g of water. Temperature of water increases from 20.00*C to 22.50*C. The specific heat of zinc is 0.390 J/g*C. What was the initial temperature of the zinc metal sample.

Chemistry Help(Calorimetry) - DrBob222, Friday, April 9, 2010 at 12:01pm
1).
q = Mass H2O x specific heat H2O x delta T

delta H = q/16.9 grams if you want it in Joules/g and that time molar mass NaOH if you want it in Joules/mole.

2)heat lost by Zn + heat gained by water = 0
[mass Zn x specific heat Zn x (Tfinal-TinitialZn)] + [mass water x specific heat water x (Tfinal-Tinital)] = 0
Solve for Tinitial Zn
Chemistry Help(Calorimetry) - catalina, Wednesday, January 12, 2011 at 10:43am
the number of calories needed to raise the temperature of 100 grams of water 10 degrees Celsius is the same as the number of calories needed to raise the temperature of 1,000 grams of water what amount?
Chemistry Help(Calorimetry) - catalina, Wednesday, January 12, 2011 at 10:46am
the number of calories needed to raise the temperature of 100 grams of water 10 degrees Celsius is the same as the number of calories needed to raise the temperature of 1,000 grams of water what amount?

Answer this Question

Related Questions

probabilityv - A school's administrators are concerned about absenteeism at ...
English - Writeacher, I left out these sentences on the same topics. I included ...
Social Studies - I'm really struggling with questions about Joan of Arc! I ...
U.S History - Forming the united States, what were the two plans that arose at ...
English - I urgently need you to check these sentences on the use of the present...
math - Attendance records at a school show the number of days each student was ...
SraJMcGin - SraJMcGin. I have a few questions; a few things that I don't ...
Math - Suppose 8 out of every 20 students are absent from school less than 5 ...
Math - Suppose 8 out of every 20 students are absent from school less than five ...
English - Hello Can you please come up with a few questions on the following ...

For Further Reading

First Name:
School Subject:
Answer: