Chapter 14

1. (p.439 Prob.6) A small immersion heater is rated at 350W. Estimate how long it will take to heat a cup of soup (assume this is 250mL of water) from 20°C to 50°C?

Answer

2. (p.439 prob.14) A 30-g glass thermometer reads 21.6°C before it is placed in 135mL of water. When the water and thermometer come equilibrium, the thermometer reads 39.2°C. What was the original temperature of the water?

Answer

3. (p.439 prob.20) When 195-g of a substance is heated to 330°C  and then plunged into a 100-g aluminum calorimeter cup containing 150g of water at 12.5°C, the final temperature, as registered by a 17-g glass thermometer, is 35.0°C . What is the specific heat of the substance?

Answer

4. (p.440 prob.26) An iron boiler of mass 230kg contains 830kg of water at 20°C. A heater supplies energy at the rate of 52,000kJ/h. How long does it take for the water (a) to reach the boiling point, and (b) to all have changed to steam?

Answer

 

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