Page 69 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

PSPM JUN 2000/2002 SF015/2 No. 7

21. A closed container contains 0.3 mol of nitrogen gas. What is the internal energy, U of
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the system if the root min square velocity, v rms of the nitrogen molecules is 180 m s ?
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(Molar mass of nitrogen = 28 g mol ) [3 m]

PSPM 2002/2003 SF017/2 No. 8

22. Nitrogen gas N 2 of 14 g is filled into a container at STP. Calculate the internal energy U
of the gas. [3 m]

PSPM 2009/2010 SF017/2 No. 14(c)

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23. The molar mass of oxygen is 32 g mol . At 300 K, calculate the

(a) root mean square speed of the oxygen molecules. [3 m]

(b) internal energy of 3 mol oxygen. [3 m]

PSPM 2014/2015 SF016/2 No. 8(c)

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24. A balloon is filled with helium at 25 C. The mass of a helium atom is 6.65  10 kg.
Calculate the

(a) root mean square speed of the helium atom. [1 m]

(b) kinetic energy of 0.5 mole helium atom. [2 m]

PSPM 2016/2017 SF016/2 No. 8(b)(iii)

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25. Two moles of a polyatomic ideal gas has volume of 0.05 m at pressure 250 kPa.
Calculate the internal energy and temperature of the gas. [4 m]

PSPM 2017/2018 SF016/2 No. 8(b)(ii)

26. At the same temperature, which gas a greater energy per mole: a diatomic gas or
monoatomic gas? Explain your answer. [3 m]

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