In a laboratory experiment to measure the specific heat capacity of copper, 0 02 kg of water at 70 - Science - Heat

Question

In a laboratory experiment to measure the specific heat capacity of
copper, 0 02 kg of water at 70 ° C was poured into a copper
calorimeter with a stirrer of mass 0 16 kg initially at 15 ° C
After stirring the final temperature reached to 45 ° C
(i) What is the quantity of heat released per kg of water per 1
° C fall in temperature?
(ii) Calculate the heat energy released by water in the experiment
in cooling from 70 ° C to 45 ° C
(iii) Assuming that heat released by water is entirely used to
raise the temperature of calorimeter 15 ° C to 45 ° C,
calculate the specific heat capacity of copper (Specific heat
capacity of water = 4200 Jkg-1ºC-1

Raveena Sharma · Accepted Answer

(i) The heat energy released by 1 kg of water, per 1 ºC fall
in temperature , is the specific heat capacity of water, i e 4200
J

(ii) The total heat energy released by water in the experiment

= m c dt = 0 02 × 4200 × (70 – 45) = 2100 J