Question

How much energy is required to raise the temperature of 2 kg of iron from
20°C to 23°C? (Refer to table of specific heat values.)
O A. 2.7 J
O B. 900 J
O c. 2700 j
O D. 1.35

Answer 1

Answer:

252000j

Explanation:

Heat lost= heat gained

4200×2×3=heat lost

Energy =25200j

Answer 2

Answer: 2700 j

Explanation:

Q (energy) = m (mass) * t (change in temp) * c (specific heat capacity)

Plug in the values...

Q = 2(3)(0.45) (specific heat capacity of iron)

Q = 2.7 Kj

convert kilo joules to joules and you get 2700 j

Hope this helps :)