Concise Physical Chemistry

c01 JWBS043-Rogers September 13, 2010 11:20 Printer Name: Yet to Come

PROBLEMS AND EXERCISES 17

Problem 1.16

(a) Calculate the expectation value of the speed of hydrogen molecules among

an ensemble at 298 K. Give units.

(b) At the same temperature,〈v〉=515 m s−^1 for nitrogen molecules. What is the

ratio〈vH 2 〉/〈vN 2 〉? Explain this ratio. Give units.

Problem 1.17

A sample of 2.50 mol of a gas was confined to a certain volume at 1.00 atm pressure

and 298 K. Assuming ideal behavior, what volume did it occupy?

Problem 1.18

If the molar volume is 24.79 dm^3 at 298.15 K and 1 bar pressure, what is the universal

gas constant. Give units.