A 0.500 kg aluminum pan on a stove is used to heat 0.250 liters of water from 20.0°C to 80.0°C. 

(a) How much heat is required? What percentage of the heat is used to raise the temperature of 

(b) The pan and 

(c) The water?

Strategy

The pan and the water are always at the same temperature. When you put the pan on the stove, the temperature of the water and the pan is increased by the same amount. We use the equation for the heat transfer for the given temperature change and mass of water and aluminum. The specific heat values for water and aluminum are given in Table 14.1.

Data given in Table 14.1

Transcribed Image Text:

Aluminum Asbestos Glass Concrete, granite (average) Copper Gold Substances Human body (average at 37 °C) Ice (average, -50°C to 0°C) Iron, steel Lead Silver Wood Solids Liquids J(kg°C) 900 800 840 387 840 129 3500 2090 452 128 235 Specific heat (c) 1700 kcal (kg°C) ² 0.215 0.19 0.20 0.0924 0.20 0.0308 0.83 0.50 0.108 0.0305 0.0562 0.4