Question

1 Name Lab Section: Date: PreLab: Specific Heat and Heat of Fusion Instructions: Prepare for this lab activity by answering the questions below. Note that this is a PreLab. It must be turned in at the start of the lab period. Time cannot be given in lab to perform Prelab activities. After the start of lab activities, PreLabs cannot be accepted. Explain your answers. Points will be taken off if your work is not neat and well organized 1. (5 points) Given that the specific heat of water is 1.00 cal/g. "C), what is the specific heat in Joules /(kg.K). 2. (5 points) if 700 grams of a metal requires 95 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat? 3. (5 points) How much heat is gained or lost when 250 grams of ice melt?

Answer 1

1. 1 cal = 4.184 Joules

So, 1.00 cal/g.°C = 4.184 J/g.°C

2. Heat = mass × specific heat × change in temperature

= 95 = 700 × C × 10

C = 0.0136 cal/ g.K

3. Enthalpy of fusion of water = 334 J/g

Heat gained = mass × enthalpy of fusion

= 250 x 334

= 83500 Joule

Or 83.5 Kj

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