Mathematical and Physical Journal
for High Schools
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# Problem P. 4439. (April 2012)

P. 4439. A sample of Oxygen gas of mass 32 g is compressed at a constant pressure from a volume of 8 litres to a volume of 7 litres. During the process the gas is cooled down such that the pressure of the gas remains constant. At the final state the temperature is 40 oC smaller than at the initial state.

a) What was the initial and final temperature of the gas?

b) What is the pressure of the gas?

c) How much work was done in joules?

d) What is the amount of heat released by the Oxygen?

(4 pont)

Deadline expired on May 10, 2012.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. a) A gáz hőmérséklete 320 K-ről 280 K-re csökkent.

b) A nyomás 3,32.105 Pa.

c) A végzett munka 332 J.

d) A leadott hő 1160 J.

### Statistics:

 134 students sent a solution. 4 points: 62 students. 3 points: 51 students. 2 points: 15 students. 1 point: 6 students.

Problems in Physics of KöMaL, April 2012