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Review exam 3 4a s11

# Review exam 3 4a s11 - Dawson More Problems for...

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Dawson More Problems for Thermochemistry You may use heats of formations tables if needed. 1. Brass has a density of 8.40 g/cm 3 and a specific heat of 0.385 J/g°C. How big of a piece of brass heated to 200°C would you need to boil a liter of water initially at 20 °C? 2. A 74.8 g sample of copper at 143.2 °C is added to an insulated vessel containing 165 mL of glycerol, C 6 H 8 O 3 (l), (d = 1.26 g/mL) at 24.8 °C. The final temperature is 31.1 °C. The specific heat of copper is 0.393 J/g°C. What is the molar heat capacity of glycerol? 3. Care must be taken in preparing solutions of solutes that liberate heat on dissolving. Calculate the heat of solution of NaOH if the temperature increases from 21 °C to 91 °C in the preparation of 500 mL of 7.0 M NaOH. 4. (a) Calculate the H for the combustion of methane. (b) What mass of methane, in kg, would need to be burned to liberate 1.00 x 10 6 kJ of heat? (c) If the quantity of heat in part (a) could be transferred with 100% efficiency to water, what volume of water, in L, could be heated from 22.7 °C to 60.8°C as a result? 5.

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Review exam 3 4a s11 - Dawson More Problems for...

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