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PHY7AW10practice-q2

# PHY7AW10practice-q2 - I certify by my signature that I will...

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1. Two moles of water vapor at T=390K are in an insulated chamber. Three ice cubes, 50g each, at an initial tempera- ture of 250K are inserted into the chamber. [Recall that for water, T MP = 273K, T BP = 373K. Other constants below.] a) Use the Three Phase Model to explain what must happen initially when the ice is added. b) Use energy-interaction diagrams to determine which will reach its phase change temperatures first, the vapor (boiling point) or the ice (melting point). Also, find the temperature of the other substance at that point. 7A-2C Quiz 2 DL Sec. ___ Name _____________________ __________________ last first for office use only

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Unformatted text preview: I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature _____________________________ c vapor = 33.6 J/mol•K, c water = 4.18 kJ/kg•K, c ice = 2.05 kJ/kg•K, Δ H melt = 333.5 kJ/kg, Δ H vap = 40.7 kJ/mol c) How much of the one substance will change phase by the time the other reaches its phase change temperature? 7A-2C Quiz 1 DL Sec. ____ Name ________________________ __________________ last first c vapor = 33.6 J/mol•K, c water = 4.18 kJ/kg•K, c ice = 2.05 kJ/kg•K, Δ H melt = 333.5 kJ/kg, Δ H vap = 40.7 kJ/mol...
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