Mathematical and Physical Journal
for High Schools
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Problem P. 4275. (October 2010)

P. 4275. The pressure of a sample of ideal gas in a container of 10 litres is 1.6 MPa, and its temperature is 25 oC. How many numbers of moles of gas are there in the container? What is the density of the gas if 10% of the mass of the gas is Helium and the rest is Nitrogen?

(4 pont)

Deadline expired on November 10, 2010.

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

Megoldás. A tartályban 2,83 mol hélium és 3,63 mol nitrogén, összesen 6,46 mol gáz van. A gázkeverék össztömege 113 g, sűrűsége $\displaystyle 11,3 g/dm^3$.

Statistics:

 258 students sent a solution. 4 points: 123 students. 3 points: 28 students. 2 points: 75 students. 1 point: 16 students. 0 point: 13 students. Unfair, not evaluated: 3 solutions.

Problems in Physics of KöMaL, October 2010