Answer to Question #134024 in General Chemistry for fdsa

Question

How much energy is released from an ice cube tray containing 96g of water at 25˚C if the tray freezes completely and has the final temperature of the freezer at -5.0˚C?

Answer 1

Initial temperature = 25⁰C

Final temperature = -5⁰C

Change in temperature= Final - initial temperature

=( -5-25)⁰C

=-30⁰C

Change in energy = (mc∆t)

Where m is mass of water, c is specific heat capatacity of water which is 4200 J/Kg/⁰C. ∆t is change in temperature.

The mass of water in Kg is 96/1000=0.096kg.

Therefore ∆H = 0.096 x 4200 x -30

=-12096 Joules of energy.

Therefore, 12096 joules or 12.096 kilojoules of energy is released.