18.0g mol-1
22.4g mol-1
28.0gmol-1
36.0gmol-1
Correct answer is C
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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