The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]

  • A 18.0g mol-1
  • B 22.4g mol-1
  • C 28.0gmol-1
  • D 36.0gmol-1
waec 2004chemistry

The correct answer is C. 28.0gmol-1

The mass of 0.8dm3 of a gas at s.t.p. is 1.0g :. 22.4dm> of gas at s.t.p. will have a molar mass of 22.4/0.8 = 28.0g mol-1

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