Question

a tray containing 0.2 kg of water is at 20°c is placed into the freezer. the temperature of the water drops to 0° in 10 minutes calculate : I the energy lost by water as it cools form 20° to 10°c (Specific heat capacity of water =4200j kg^-1 k^-1 2) time taken for water to turn completely into ice (sp latent heat of fusion of water = 3.35x10^5 j kg^-1​

Answer 1

Answer:

a tray containing 0.2 kg of water is at 20°c is placed into the freezer. the temperature of the water drops to 0° in 10 minutes calculate : I the energy lost by water as it cools form 20° to 10°c (Specific heat capacity of water =4200j kg^-1 k^-1 2) time taken for water to turn completely into ice (sp latent heat of fusion of water = 3.35x10^5 j kg^-1

Answer 2

Answer:

8400J

Explanation:

As we know: Q=mc$delta$T

m=0.2kg

delta T= 20-10=10

c=4200

so energy lost when it cools down from 20C to 10C

Q= 0.2*4200*10=8400J