Chemistry/physics-molar heat capacity?

[monarchus]

Chemistry/physics--molar heat capacity?

Homework Statement

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.

Homework Equations

Q = n x c x T

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

The Attempt at a Solution

5 = (1.5 / 58.9 ) x c x 3.42

c = 57.4

 

[Borek]

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