PS13.Thermochemistry

Basic Chemistry (Chapters 1-16)

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CHEMISTRY 2001 NAME PROBLEM SET #13: Thermochemistry DATE PERIOD  READ  SECTIONS  10.4  - 10.7!  1. Define each of the following terms: endothermic process exothermic process calorimetry enthalpy heat of reaction 2. Heat of combustion is defined as the heat of reaction for the complete burning of one mole of a substance. Give the standard conditions for heat of combustion: 3. Gasohol contains ethanol, C 2 H 5 OH ( l ), which reacts with oxygen when burned to produce CO 2 (g) and H 2 O (g). The equation for the complete combustion of ethanol is: C 2 H 5 OH ( l ) + 3 O 2 ( g ) 2 CO 2 ( g ) + 3 H 2 O ( g ) H
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Unformatted text preview: rxn = -1235 kJ How much heat is produced when 12.5 g of ethanol is burned? 4. When carbon disulfide forms from its elements, heat is absorbed: C ( s ) + 2 S ( s ) CS 2 ( l ) ∆ H rxn = +89.3 kJ Calculate the amount of heat (in kilojoules) absorbed when 5.66 g of carbon disulfide forms. (HINT: BOB) 5. How much energy is needed to melt 20.0 grams of ice at 0 º C? 6. Prepare a graph to show the temperature changes as ice melts, water warms, and vaporizes. Label the phases and the indicate the amounts of energy involved in each phase....
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PS13.Thermochemistry - rxn =-1235 kJ How much heat is...

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