Mathematical and Physical Journal
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# Problem P. 4522. (March 2013)

P. 4522. News: Each saved cubic metre of natural gas protects the environment from the emission of 1.7 kg of carbon-dioxide gas. 97% of the natural gas is methane.

a) What is the temperature of the methane if 1.7 kg carbon-dioxide is emitted during the burning of 1 cubic metre of methane at normal pressure?

b) How many kg Oxygen is used and how much water vapour is gained?

c) By what amount is the calorific value of 1 cubic metre of methane smaller than its heat of combustion?

(4 pont)

Deadline expired on April 10, 2013.

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

Megoldásvázlat. $\displaystyle a)$ $\displaystyle 39~^\circ$C-os metán.

$\displaystyle b)$ 2,5 kg oxigén fogy el, és 1,4 kg vízgőz keletkezik.

$\displaystyle c)$ A különbség kb. 3,5 MJ.

### Statistics:

 79 students sent a solution. 4 points: Berezvai Orsolya, Bingler Arnold, Csáky Pál, Csathó Botond, Csernák Tamás, Csiba Annamária, Czipó Bence, Damó-Csorba Borbála, Dávid Bence, Dombai Tamás, Farkas Domonkos, Garai Zoltán, Garami Anna, Gróf Viktória, Holczer András, Janzer Barnabás, Juhász Péter, Kaprinai Balázs, Kertész Soma Marcell, Koch Lilla, Kozár Eszter, Mezősi Máté, Mile Alexander, Morvay Bálint, Muth Lajos, Pázmán Zalán, Reitz Angéla, Sárvári Péter, Sisák Mária Anna, Szabó 8314 Pál, Szathmári Balázs, Székely Bálint, Szilágyi András, Szirbik Bence, Tanner Martin, Tatár Dániel, Váli Tamás, Varju Ákos, Virágh Anna. 3 points: 34 students. 2 points: 2 students. 1 point: 4 students.

Problems in Physics of KöMaL, March 2013