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# Quiz 11 - Ch11_#18(Points:6.66 A mass of 1.663 g of an...

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Ch11_Practice problems Question MC #18   (Points: 6.66)      A mass of 1.663 g of an unknown gas is introduced into an evacuated 2.00 L flask. If the pressure in the flask is 0.544 atm at 78 ° C, which of the following gases might be in the flask? ( R = 0.08206 L·atm/mol·K) 1.  NH 3 2.  N 2 O 3.  HCl 4.  N 2 5.  C 2 H 2 . Ch11_Practice problems Question MC #3 (Points: 6.66)   If the volume of a confined gas is quadrupled while its temperature remains constant, what change will be observed? 1. The average velocity of the molecules will quadruple. 2. The pressure of the gas will quadruple. 3. The density of the gas will decrease to 1/2 its original value. 4. The average velocity of the molecules will double. 5. The pressure of the gas will decrease to 1/4 its original value. Ch11_Practice problems Question  MC #32   (Points: 6.66)      The average velocity of a gas molecule is 1.  directly proportional to the gas constant, R . 2.  directly proportional to the square root of its mass.

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3.  directly proportional to the square root of its temperature in K. 4.  inversely proportional to the square of its mass. 5.  inversely proportional to its kinetic energy.
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