Question

How much energy will it take for 0.5 kg water to rise from a temperature of 25℃ to 35℃?

• A.
  5 kcal
• B.
  10 kcal
• C.
  20 kcal
• D.
  2.5 kcal

Answer 1

The correct option is A

5 kcal
Kilocalorie - Heat energy required to raise the temperature of 1 kilogram water through 1℃

Heat energy required to raise the temperature of 1 kg water through 10℃ = 10 kcal
Hence, heat energy required to raise the temperature of 0.5 kg water through 10℃ = $10\times 0.5=5kcal$
Thus 5 kcal is required for 0.5 kg water to rise from a temperature of $25°Cto35°C$.