Question

What is the energy change when the temperature of 14.4 grams of solid iodine is decreased from 35.6 °C to 23.8 °C ?
Answer:  Joules.

How much energy is required to raise the temperature of 13.6 grams of solid silicon from 24.0 °C to 38.9 °C ?
Answer:  Joules

Answer 1

Ans 1 :

Energy change = mass x specific heat x change in temperature

specific heat of solid iodine = 0.427 J/g^oC

putting values :

= -14.4 x 0.427 x (35.6 - 23.8)

= -72.5 Joules

Ans 2 :

using the same formula

Energy = mass x specific heat x change in temperature

specific heat of solid silicon is 0.703 J/g^oC

= 13.6 x 0.703 x (38.9 - 24.0)

= 142.4 Joules