In a physics lab students are conducting an experiment to learn about the heat c

Question

In a physics lab students are conducting an experiment to learn about the heat capacity of different materials. The first group is instructed to add 1.5-g lead pellets at a temperature of 92°C to 265 g of water at 16°C. A second group is given the same number of 1.5-g pellets as the first group, but these are now aluminum pellets. Assume that no heat is lost to or gained from the surroundings for either group. (a) If the final equilibrium temperature of the lead pellets and water is 23°C, how many whole pellets did the first group use in the experiment? The specific heat of lead is 0.0305 kcal/(kg · °C). (b) Will the final equilibrium temperature for the second group be higher, lower, or the same as for the first group? The specific heat of aluminum is 0.215 kcal/(kg · °C). higher lower the same Correct: Your answer is correct. (c) What is the equilibrium temperature of the aluminum and water mixture for the second group? °C

Explanation / Answer

a)    For first group

heat lost by lead pellets = heat gained by water

=> n * (1.5 * 10-3 * 0.0305 * 69) = 0.265 * 1 * 7

=>    n = 587.63 pellets        ------------------>   pellets did the first group use in the experiment

b)     For second group

=> heat lost by aluminium pellets = heat gained by water

=> 587.63 * (1.5 * 10-3 * 0.215 * (92-T)) = 0.265 * 1 * (T-16)

=>   0.1895 * (92-T) =   0.265 * (T-16)

=>     92 - T = 1.4T - 22.4

=> T = 47.67   degree   C          ------------------->    the final equilibrium temperature for the second group

=>    final equilibrium temperature for the second group is higher than the first group .

c)   the equilibrium temperature of the aluminum and water mixture for the second group =   47.67   degree C

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