Pasco TD-8557 Basic Calorimetry Set Manuel d'utilisateur télécharger pdf (Page 6)

Basic Calorimetry Set

Data

Calculations

From your data, make the calculations necessary to determine the mass of the cold and hot

water (M

water cold

and M

water hot

), and also the temperature changes undergone by each

(∆T

cold

and ∆T

hot

). Enter your results in Table 1.2.

Using the equations shown below, calculate ∆H

cold

and ∆H

hot

, the heat gained by the cold

and hot water, respectively. Enter your results in the table.

∆H

cold

= (M

water cold

)(∆T

cold

)(1 cal/g K)

∆H

hot

= (M

water hot

)(∆T

hot

)(1 cal/g K)

Questions

1. Which had more thermal energy, the two cups of water before they were mixed

together or after they were mixed? Was energy conserved?

2. Discuss any unwanted sources of heat loss or gain that might have had an effect on

the experiment.

3. If 200 g of water at 85° C were added to 150 g of water at 15° C, what would be the

final equilibrium temperature of the mixture?

Table 1.1: Data

Trial 1 Trial 2 Trial 3

cal

cal + water cold

cal + water hot

cold

hot

final

Table 1.2: Calculations

Trial 1 Trial 2 Trial 3

water cold

water hot

∆T

cold

∆T

hot

∆H

cold

∆H

hot

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Pasco TD-8557 Basic Calorimetry Set Manuel d'utilisateur Page 6

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