REPUBLIC OF CAMEROON The UNIVERSITY OF BAMENDA

Peace — Work - Fatherland P.O. BOX 39 Bambili

QUESTION 1 (6 Mks)

In a constant-volume gas thermometer, the pressure at 20.0°C is 0.980 atm. (a) What is the

pressure at 45.0°C? (b) What is the temperature if the pressure is 0.500 atm?

QUESTION 2 (5 Mks)

A pair of eyeglass frames is made of epoxy plastic. At room temperature (20.0°C), the frames

have circular lens holes 2.20 cm in radius. To what temperature must the frames be heated if

lenses 2.21 cm in radius are to be inserted in them? The average coefficient of linear expansion

for epoxy is 1.30 X 10

(°C)-

10.0°C, how much will spill over when the temperature rises to 30.0°C?

QUESTION 4 (6 Mks)

One mole of oxygen gas is at a pressure of 6.00 atm and a temperature of 27.0°C. (a) If the gas

is heated at constant volume until the pressure triples, what is the final temperature? (b) If the

gas is heated until both the pressure and volume are doubled, what is the final temperature?

QUESTION 5 (8 Mks)

A 1.0-mol sample of an ideal gas is kept at 0.0°C during an expansion from 3.0 L to 10.0 L. (a)

x 10

3

J as exhaust to a cold reservoir, (a) Find the efficiency of the engine.(b) How much work

does this engine

do in one cycle? ALL THE BEST!!!!