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CHEM 302 HW1 - Version 023 Homework 1 Lyon(53565 This...

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Version 023 – Homework 1 – Lyon – (53565) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This homework assignment is due Wednes- day, January 23, by 4:00PM. 001 10.0 points A property that determines the direction of heat flow is 1. combustion. 2. calorie. 3. entropy. 4. temperature. 002 10.0 points The combustion of a certain amount of methane produces 100 kJ of energy. Dur- ing this process the amount of energy in the universe 1. increases by 100 kJ. 2. does not increase nor decrease. 3. The answer cannot be determined with- out knowing the chemical equation for this reaction. 4. decreases by 100 kJ. 003 10.0 points For which of the following processes does the entropy of the universe decrease? 1. freezing one mole of water to ice at - 10 C 2. None of these is correct. 3. freezing one mole of water to ice at 0 C and then cooling it to - 10 C 4. freezing one mole of water to ice at 0 C 5. melting one mole of ice to water at 0 C 004 10.0 points A substance has a molar heat of fusion of 5.90 kJ/mol. Calculate the molar mass of the substance, given that a 70.8 g sample of it absorbs 4.83 kJ on melting. Answer in units of g / mol. 005 10.0 points The melting of ice is an example of a physi- cal process that can be non-spontaneous but is increasingly likely to occur as the temper- ature of the system increases. What charac- teristics of Δ H and Δ S for the process would correspond to this behavior? 1. Exothermic process with increasing sys- tem disorder 2. Exothermic process with decreasing sys- tem disorder 3. Endothermic process with decreasing sys- tem disorder 4. More than one of these examples would produce the results described for the melting of ice.
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