18B

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1. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) What is the average kinetic energy of hydrogen atoms on the 5500C surface of the Sun? (b) What is the average kinetic energy of helium atoms in a region of the solar corona where the temperature is 1.73 x 106 K? 2. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.028. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER There are two important isotopes of uranium - 235U and 2380; these isotopes are nearly identical chemically but have different atomic masses. Only 235U is very useful in nuclear reactors. One of the techniques for separating them (gas diffusion) is based on the different average speeds Vrms of uranium hexafluoride gas, UF6. (Use k = 1.38 x 10-25 j/K for this question.) (a) The molecular masses for 235UF6 and 238UF6 are 349.0 g/mol and 352.0 g/mol, respectively. What is the ratio of their average speeds? (Enter your answer to at least 4 decimal places.) V235 V238 (b) At what temperature would their average speeds differ by 1.60 m/s? K 3. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.024. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The escape speed from the Moon is much smaller than from Earth and is only 2.38 km/s. At what temperature would nitrogen molecules (with a molecular mass equal to 28.01 g/mol) have an average speed Vrms equal to the Moon's escape speed? K 4. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.034.TUTORIAL. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Determine the change in internal energy of a monatomic ideal gas that expands from an initial volume of 1.43 m to a final volume of 2.67 ms. During this process, the pressure of the gas remains at a constant value of 2.62 x 103 Pa. (129 Tutorial5. [-l1 Points] WAUNIPHYSAV1 18.P.039. ASK YOURTEACHER PRACTICE ANOTHER Consider 6.47 moles of an Ideal dlatomlc gas at 250C. (a) What is the tonal heat capacity of the gas if the molecules do not vibrate? at constant volume [:] J/K at constant pressure :] J/K (b) What is the total heat capacity of the gas if the molecules do not translate or rotate, but do vibrate about their molecular axes? at constant volume :] J/K at constant pressure [: J/K 6. [-/1 Points] WAUNIPHYSAV1 18.P.040.TUTORIAL. ASK YOURTEACHER PRACTICE ANOTHER A sample of a diatomic gas contains 2.18 males at 10.0\"C. The gas is heated at constant pressure until its volume increases to 2.40 times its original volume. Determine the amount of heat added to the gas. (Assume that the temperatures are high enough to affect the rotational energy states of the gas molecules, but not high enough to affect the vibrational energy states.) J IE tutorial 1. [-l1 Paints] WAUNIPHYSAV1 18.P.022. ASK YOUR TEACHER PRACTICE ANOTHER Some incandescent light bulbs are lled with argon gas. What is yr,\"s for argon atoms near the lament, assuming their temperature is 2900 K? The atomic mass of argon is 39.948 u. :I ms 8. [-I1 Points] WAUNIPHYSAV1 18.P.030. ASK YOUR TEACHER PRACTICE ANOTHER The average kinetic energy of the molecules in a mixture of argon and xenon gas at a certain temperature in a container is 9.13 x 10'21 J. (The atomic masses of argon and xenon are 39948 g/mol and 131.29 g/mol, respectively.) (a) What is the rms speed of the molecules of the two gases? Vrms, Ar = m/s :I v...., xe = :1 "1/5 (b) What is the temperature of the gas mixture? :1"C 9. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.037. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider 20 particles that have the following speeds: 3 have a speed of 1.80 m/s, 2 have a speed of 2.00 m/s, 7 have a speed of 2.90 m/s, 3 have a speed of 3.40 m/s, 1 has a speed of 4.20 m/s, and 4 have a speed of 9.00 m/s. (a) Determine the average speed of the particles. m/s (b) Determine the rms speed of the particles. m/s (c) Determine the most probable speed of the particles. m/s 10. [-/1 Points] DETAILS WAUNIPHYSAV1 18.P.043. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The probability distribution for bromine gas is shown in the diagram below. Determine the temperature of the gas. Take the molar mass of bromine to be 160 g/mol. K v (m/s) 620 1240 1860 2480 3100