Solve all questions MULTIPLE CHOICE. Choose the one alternative that best comple

Question

Solve all questions MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Tsothermal" means A) at constant temperature B) at constant pressure C) at ideal temperature and pressure conditions D) at variable temperature and pressure conditions E)that AHrxn®? A) Atoms are neither created nor destroyed by ordinary chemical reactions B) Collisions between gas molecules do not result in the loss of energy C The volume ocoupied by all of the gas molecules in a container is negligble compared to the volume of the container. D) Gases consist of molecules in continuous, random motion. E) Attractive and repulsive forces between gas molecules are negligible. 3) A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of C) 2.01 HF to the rate of effusion of HBr is- A) 163 B) 4.04 D) 0.247 E) 0497 4 4) Which one of the following gases would have the highest average molecular speed at 25 C?4 A) CH4 B) O2 C) SF6 D) CO2 5) The van der Waals equation for real gases recognizes that A) the non-zero volumes of gas particles effectively decrease the amount of "empty space between them B) the molecular attractions between particles of gas decreases the pressure exerted by the gas C) gas particles have non-zero volumes and interact with each other D) molar volumes of gases of different types are different E) all of the above statements are true 6) A gas at a pressure of 10.0 Pa exerts a force of N on an area of 5.5 m2 D) 1.8 A) 0.55 B) 55 C)5.5 7) A gas mixture of N2 and H2 has a total pressure of 9.40 atm and contains 11.3 mol of gas. If the 7) C) 4.51 8) A sample of gas (1.9 mol) is in a flask at 21 ° C and 697 mm Hg The flask is opened and more gas 8) E) 18 partial pressure of N2 is 4.89 atm, how many moles of H2 are in the mixture? A) 11.3 B) 5.65 D) 5.88 E) 5.42 is added to the flask. The new pressure is 841 mm Hg and the temperature is now 26°C There are now mol of gas in the flask. A) 1.6 B) 0.28 C) 3.5 D) 2.9 E)23

Explanation / Answer

1) The answer is A . Iso thermal means constant temperature.

2) The answer is A. it is the law of conservation of mass.

3) The answer is C.

rate of effusion of two gases :

r1/r2 = sqrt. (M2/M1)

r1 = rate of effusion for gas 1

r2 = rate of effusion for gas 2

sqrt.= square root

M1 = molar mass of gas 1

M2 = molar mass of gas 2

molar mass of HF = 20

molar mass of HBr = 81

= sqrt . ( 81 /20) = 2.012

4) The answer is A ( CH4).

average speed = sqrt. (3RT/M)

so ; M = molar mass

here speed is inversely proportional to the molar mass

hence the molecule having lower molecular mass will move faster

so calculate the molar mass of each compound ;

CH4: 16

O2:32

SF6: 146

CO2: 44

N2:28

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