MULTIPLE CHOICE Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question. 1) 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 2) A) Atoms ane neither created nor destroyed by ordinary chemical reactions. B) Collisions between gas molecules do not result in the loss of energy. C) The volume occupied by all of the gas molecules in a container is negligible 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 HiBr gases developed a leak. The ratio of the rate of effusi f3 4) Which one of the following gases would have the bighest average molecular speed at 25 C?4 5) The van der Waals equation for real gases recognizes that HF to the rate of effusion of HBr is A) 163 B) 4.04 C) 2.01 D) 0.247 E) 0497 4 A) CH4 B) O2 C) SF6 D) CO2 5) 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 E) 18 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) partial pressure of N2 is 4.89 atm, how many moles of 1H2 are in the mixture? A) 11.3 B) 5.65 C) 451 D) 5.88 E) 5.42 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) 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)35 D) 2.9 E)23

Explanation / Answer

Ans 1 : A) At constant temperature

As the word suggests , isothermal means when the temperature remains constant. When the reactions take place in the isothermal conditions , the change in temperature is zero , as the temperature remains constant throughout the reaction.

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