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The mass of 800cm³ of a gas X at s.t.p. is 1.0g. ...

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

View answer & explanation

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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