Worksheet Chapter 6 calorimetry Key PDF

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CHEM 1300 Worksheet Chapter 6: Calorimetry

General Chemistry I Name:

Calculate q for each of the following situations. Show all calculations and use the proper number of significant figures. 1)

12.0 g of water heated from 20.0oC to 45.0oC

2)

30.0 g of aluminum cooled from 65.0oC to -15.0oC

3)

500.0 g of copper heated from 40.0oC to 450.0oC

4)

3.5 g of gold is cooled from 37oC to 22oC

5)

A 2.85 g lead weight, initially at 10.3 ֯C, is submerged in 7.55 g of water at 52.3 ֯C in an insulated container. What is the final temperature of both substances at thermal equilibrium?

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6)

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene is burned in a bomb calorimeter, the temperature rises from 24.25 ֯C to 32.33 ֯C. Find ΔErxn for the combustion of naphthalene. The heat capacity of the calorimeter is 5.11 kJ/ ֯C.

7)

For the reaction o C(graphite) + O2(g) → CO2(g) Δ H rxn = –393 kJ How many grams of C(graphite) must be burned to release 275 kJ of heat?

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