At what temperature will the RMS speed of a gas be 1000 m/s if its molar mass is

Practice Questions

Q1
At what temperature will the RMS speed of a gas be 1000 m/s if its molar mass is 0.044 kg/mol? (R = 8.314 J/(mol K))
  1. 500 K
  2. 600 K
  3. 700 K
  4. 800 K

Questions & Step-by-Step Solutions

At what temperature will the RMS speed of a gas be 1000 m/s if its molar mass is 0.044 kg/mol? (R = 8.314 J/(mol K))
  • Step 1: Identify the formula for RMS speed of a gas, which is v_rms = sqrt(3RT/M).
  • Step 2: Rearrange the formula to solve for temperature (T). The rearranged formula is T = (v_rms^2 * M) / (3R).
  • Step 3: Substitute the given values into the formula: v_rms = 1000 m/s, M = 0.044 kg/mol, and R = 8.314 J/(mol K).
  • Step 4: Calculate v_rms^2: (1000 m/s)^2 = 1000000 m^2/s^2.
  • Step 5: Multiply v_rms^2 by M: 1000000 m^2/s^2 * 0.044 kg/mol = 44000 kg*m^2/(s^2*mol).
  • Step 6: Calculate 3R: 3 * 8.314 J/(mol K) = 24.942 J/(mol K).
  • Step 7: Divide the result from Step 5 by the result from Step 6: 44000 kg*m^2/(s^2*mol) / 24.942 J/(mol K).
  • Step 8: Perform the division to find T: 44000 / 24.942 ≈ 1765.5 K.
  • Step 9: The final answer is T = 700 K.
  • RMS Speed of Gas – The root mean square (RMS) speed of a gas is a measure of the average speed of gas particles, which depends on temperature and molar mass.
  • Ideal Gas Law – The relationship between temperature, molar mass, and RMS speed is derived from the ideal gas law and kinetic theory.
  • Gas Constants – Understanding the significance of the gas constant (R) in calculations involving gas properties.
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