Question

How much heat energy is nessary to raise the temperature of 2kg of water from 25°C to 100°C.


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Answer 1

This uses specific heat capacity. The formula is E=mcθ where E is energy in joules, m is mass of substance in kg, c is the specific heat capacity of a substance in joules per kelvin per kg and θ is the change in temperature in either Celsius or Kelvin.

Specific heat capacity of water is 4200

m=2kg

C=4200

Change in temperature=100-25=75

E=2 ×4200×75

E=630,000J

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Answer 2

Answer:

This uses specific heat capacity. The formula is E=mce where E is energy in joules, m is mass of substance in kg, c is the specific heat capacity of a substance in joules per kelvin per kg and is the change in temperature in either Celsius or Kelvin.

Specific heat capacity of water is 4200

m=2kg

C=4200

Change in temperature=100-25=75

E=2 ×4200x75

E=630,000J

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