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
Correct Answer: Option C
Explanation
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