Quiz3Asolns

# Quiz3Asolns - Quiz 3A DL SEC Grade Last name first name...

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Quiz 3A DL SEC _ _ Grade: 02/09/08 Last 6 digits of student ID _ _ _ _ _ _ Last name, first name: ________________ ________________ First three letters of your last name _ _ _ Useful formulae: Δ E TOT = Q + W; Δ E TOT = Δ E th + Δ E bond + Δ KE + Δ PE m-s + . ..; Δ E th =mc Δ T; Δ E bond =±| Δ m Δ H|; Δ KE= ½ M (v f 2 -v i 2 ); PE m-s = ½ k (x f 2 -x i 2 ). Useful constants: T boil (LN) = 196°C Δ H vap (LN)=2.79 kJ/mol c(N 2 ) gas = 29.12 J/(mol K) Solutions with no explanation will receive no credit. You have a very big cubic insulated container completely filled with liquid nitrogen (LN) at - 196°C . Inside the LN there is a spring loaded with a mass M of 0.3 kg situated at 0.12 m from equilibrium (i.e., the mass is initially at rest). After the mass is released, the friction between the mass and the LN slows down the mass until it stops. The mass stops within the closed container and comes to rest (you can neglect any gravitational potential energy contribution). You observe that some liquid nitrogen changes phase. Measuring the volume of the bubbles generated by the friction effects you find that 0.15 moles

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## This note was uploaded on 05/12/2010 for the course PHY 7 taught by Professor Staff during the Spring '08 term at UC Davis.

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Quiz3Asolns - Quiz 3A DL SEC Grade Last name first name...

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