Q6 / 160 · AP EAMCET 2019 (21 Apr Shift 2) · Chemistry

If the kinetic energy and RMS speed of a gas at a certain temperature are 4.0 kJ mol-1 and 5.0×104 cm s-1, respectively. The molecular weight of the gas is

  • A
    16
  • Correct answer
    B
    32
  • C
    64
  • D
    44

Solution

As the kinetic energy expression used the RMS speed of the gas as:12Mv2rms=5.0×10412M(5.0×104×10-2)2rms=4×103M=0.032 Kg mole-1

Therefore, molecular weight is 0.032 Kg per mole or 32 g per mole.

Hence, the correct answer is option: 'B'.

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