A 82.5 g copper bar was heated to 221.32 oC and placed in a coffee cup calorimeter containing 323.7 mL of water at 22.55oC. The final temperature of the water was recorded to be 26.15oC. How much heat was gained by the water?

Question

28-10-2022
Chemistry

Answered

A 82.5 g copper bar was heated to 221.32 oC and placed in a coffee cup calorimeter containing 323.7 mL of water at 22.55oC. The final temperature of the water was recorded to be 26.15oC. How much heat was gained by the water?

Answer :

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KerringtonM295381 KerringtonM295381 · Answer 1 · 2022-10-28T18:11:04-04:00

In this question, we have a situation in which we have to use the Calorimetry formula, which is how much heat was released or absorbed (in Joules), after we had a change in temperature of a compound. The formula for this Calorimetry question is:

Q = mcΔT

Where:

Q = is energy as Heat

m = mass in grams, 323.7 mL is 323.7 grams (1 mL = 1 gram of water)

c = is the specific heat capacity, 4.184 J/g°C

ΔT = the change in temperature, calculated as Final Temperature - Initial T

26.15 - 22.55 = 3.6°C

Now we add these values into the formula:

Q = 323.7g * 4.184 * 3.6

Q = 4.876 Joules or 4.9 kJ was the heat gained by water