CHE 11, Fall 1998
Quiz 5
October 16, 1998

Show your work for full credit. Give your answers with the correct number of significant figures.

Useful information:

Atomic masses Ar, 39.95 C, 12.01 Cl, 35.45 F, 19.00 H, 1.008 N, 14.01 O, 16.00

1. A container with a volume of 10.0 L and a temperature of 25 ^oC contains 2.80 g of nitrogen gas (N₂), 0.403 g of hydrogen gas (H₂), and 79.9 g of argon gas (Ar). What is the total pressure in this container? (3 points)

2. Which conditions of P, T, and n are most ideal?

(a) high P, high T, and high n
(b) low P, low T and low n
(c) high P, low T, and high n
(d) low P, high T, and high n
(e) low P, high T, and low n

3. Consider a series of balloons at the same temperature, each filled with one of the following gases: F₂, Cl₂, NO, NO₂, and CH₄. Arrange these gases in order of rates of effusion, indicating which is the fastest gas to escape from the balloon. Explain your answer briefly. (2 points)

4. Would you expect the reaction shown to be exothermic or endothermic? Explain briefly, giving the sign of DH. (3 points)

Cl_{2 (g)} 2 Cl