Quiz1 - X is or is not an extensive property Give a reason...

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Chemistry 520 Winter Quarter 2008 Take Home Quiz 1 This quiz is due no later than 4 pm on Wednesday, Jan. 16, 2008 in room 0048 McPherson lab. Submit your answers on single sided paper. 1. A system receives 50 J of electrical energy and delivers 150 J of pressure-volume work against the surroundings while gaining 300 J of heat energy. What is the change in the internal energy of the system? 2. When 375 J of heat is added to 35.0 g of benzene, C 6 H 6 , the temperature increases by 6.18 C. Calculate the molar heat capacity of benzene (J/mole - C). (Atomic weights: C = 12.01 g/mole, H = 1.008 g/mole). 3. Determine which of the following reactions at constant pressure represent systems in which work is done on the system by the surrounding environment. (a) 2 CO(g) + O 2 (g) -→ 2 CO 2 (g) (b) 2 H 2 O 2 (l) + N 2 H 4 (l) -→ N 2 (g) + 4 H 2 O(g) (c) N 2 (g) + O 2 (g) -→ 2 NO(g) (d) PCl 3 (l) + Cl 2 (g) -→ PCl 5 (s) 4. Let X represent the quantity V 2 with dimensions (length)
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Unformatted text preview: X is or is not an extensive property. Give a reason that X is or is not an intensive property. 5. Calculate the work done when 50 g of iron reacts with hydrochloric acid to produce hydrogen gas in (a) a closed vessel of fixed volume, and (b) an open beaker at 25 ◦ C. 6. When a ball of mass m is dropped through a height difference Δ h , its potential energy changes by an amount mg Δ h , where g is the acceleration of gravity, equal to 9.81 m/s 2 . Suppose all this energy gets dissipated into the internal energy of the ball once it has stopped bouncing. If the specific heat of the material in the ball is 0.850 J/g-K, calculate the height from which the ball must be dropped to increase the temperature of the ball by 1.00 ◦ C. 7. Discuss the proposition that, to a certain degree of approximation, a living organism is a steady-state system....
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