Helium atoms interact very weakly with each other; helium only liquefies at 4.2 K at standard pressure. What is the kinetic energy of a helium atom: (a) at 100. K? (b) at 10.0 K?
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Helium atoms interact very weakly with each other; helium only liquefies at 4.2 K at standard
pressure. What is the kinetic energy of a helium atom:
(a) at 100. K?
(b) at 10.0 K?
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- The atomic and molecular rms speeds of gases, vrms, are usually quite large, even at low temperatures. What is vrms, in meters per second, for helium atoms at 5.85 K (which is close to the point of liquefaction)?(a) What is the average kinetic energy in joules of a hydrogen atom on the 5500 °C surface of the Sun? The Boltzmann's constant is k =1.38×10¯2³ J/K KE av . 3.99 x10-21 J (b) What is the average kinetic energy of a helium atom in a region of the solar corona where the temperature is 6 x10³°K? KE av . 3.27 x10-18 ! No, that's not the correct answer.The most probable speed for molecules of a gas at 296 K is 263 m/s. What is the molar mass of the gas? (You might like to figure out what the gas is likely to be.)
- At what temperature do atoms of helium gas have the same rms speed as molecules of hydrogen gas at 20.0C?The total power emitted by a spherical black body of radius Rat a temperature T is P,. R Let P, be the total power emitted by another spherical black body of radius kept at 2 temperature 27T . The ratio, is (Give your answer upto two decimal places) P2The mass of a helium atom is 6.650e–27 kg. What is the average speed of a helium molecule in a monoatomic gas at a temperature of 77 C?
- The most probable speed an atom/molecule in an ideal gas in thermodynamic equilibrium at temperatureT will have is vmp=(2kgT/M)/2. What is the most probable speed in a gas of hydrogen molecules (H2) at 77 °C? m,=1.67x10 27 kg, kg=1.38x10 23 J/K.My Dyson vacuum cleaner can achieve a pressure as low as 10−8 Pa at 25C. How many molecules are there in a cubic centimeter at this pressure and temperature?At what temperature (in C) is the rms speed of helium atoms(molar mass 4.00 g/mol) the same as the rms speed of nitrogen molecules(molar mass 28.0 g/mol) at 20.0 C? (Note that helium remains agas at temperatures above -269 C.)
- The temperature of an ideal monatomic gas is increased from 25 C to 50 C. Does the average translational kinetic energy of each gas atom double? Explain. If your answer is no, what would the final temperature be if the average translational kinetic energy was doubled?A krypton-84 atom has a mass of 1.39 x 10-25 kg. (a) What temperature (in K) would a gas composed entirely of krypton-84 atoms have to be at in order for the rms speed of the atoms to equal the escape speed from Earth, 1.12 x 10 m/s? K (b) What temperature (in K) would a gas composed entirely of krypton-84 atoms have to be at in order for the rms speed of the atoms to equal the escape speed from the Moon, 2.37 x 10 m/s? K5