# Homework Help: Chemistry/physics-molar heat capacity?

1. Jul 13, 2008

### monarchus

Chemistry/physics--molar heat capacity?

1. The problem statement, all variables and given/known data

When 5.00 J of heat are added to 1.50 g of cobalt, its temperature rises by 3.42 degree celsius. What is the molar heat capacity o cobalt in J mol-1 K-1?

A) 0.710
B) 0.875
C) 2.30
D) 57.4

P.S. if your answer is A, please explain why you want to add 273 to the change of the temperature to make it Kelvin. Wasn't change of temperature is the same no matter it is in the form of degree Celsius or Kelvin?

thank you.

2. Relevant equations

Q = n x c x T

Q = heat evolved
n = number of moles
c = molar heat capacity
T = change in temperature

3. The attempt at a solution

5 = (1.5 / 58.9 ) x c x 3.42

c = 57.4

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Last edited by a moderator: Jul 13, 2008
2. Jul 13, 2008

### Staff: Mentor

Re: Chemistry/physics--molar heat capacity?

D is the correct answer. You are right, delta T is the same regardless of whether you use Kelvin or Celsius scale.