Ideally, when a thermometer is used to measure the temperature of an object, the
ID: 1425142 • Letter: I
Question
Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 31.4 g, a specific heat capacity of c = 857 J/(kg C°), and a temperature of 11.8 °C. It is immersed in 114 g of water, and the final temperature of the water and thermometer is 67.9 °C. What was the temperature of the water in degrees Celsius before the insertion of the thermometer?
Explanation / Answer
the net energy is
Q net = Q( thermometer) + Q( water) = 0
MC delT + mC del T water= 0
del T water = - M C del T/ mC( water)
=-( 31.4 * 10^-3 kg) ( 857) ( 56.1)/0.114 ( 4186
=-3.163
Tf- Ti = -3.163
Ti = Tf + 3.163
=67.9 + 3.163
=71.063 C
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