Question

how much energy, in joules, is released when 10 kilograms of ice is cooled from -10 Celsius to -20 Celsius?

Answer 1

The specific heat capacity of ice is 2.108 kJ/kgK. The heat released can be calculated from the formula

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Thus the amount of energy released in Joules is 210,800 J.

Answer 2

420,000 Joules

Step-by-step explanation

When ice cools from -10 t0 -20, it releases energy in form of heat. This energy is given by;

Quantity of heat (Energy) = mθC

Where m ⇒ mass of ice

θ ⇒ Change in temperature.

C ⇒ specific heat capacity of ice (water) = 4200 J/Kg/K

∴ Energy = mθC

= 10 × (-10 - -20) × 4200

= 10 × 10 × 4200

= 420,000 Joules