Mathematical and Physical Journal
for High Schools
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Problem P. 4459. (September 2012)

P. 4459. A certain amount of ideal gas contains Helium atoms and Oxygen molecules. The mass of the mixture is 20 gram, its volume is 18.63 litres at a temperature of 27 oC and at a pressure of 200 kPa.

How many moles of Helium and how many moles of Oxygen are there in the gas?

(4 pont)

Deadline expired on October 10, 2012.

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

Megoldásvázlat. 1 mol hélium és 0,5 mol oxigén.


230 students sent a solution.
4 points:158 students.
3 points:11 students.
2 points:26 students.
1 point:23 students.
0 point:8 students.
Unfair, not evaluated:4 solutionss.

Problems in Physics of KöMaL, September 2012