How much energy is needed to heat enough water to make s cup of tea (250 ml), if the water is initially at 20.0 degrees celsius and you want to increase the temperature to 85.0 degrees celsius ? ( assume that 250ml = 250 g)

To solve this question you need to know the specific heat of the object, which is water. The specific heat of water is 1 calorie/gram °C = 4.2joule/gram °C. The energy needed would be:

Q= c*m*ΔT
Q= 1 calorie/gram °C * 250 g * (85-25°C )
Q= 15000 calorie= 63000J

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