If 200cm³ of a gas at s.t.p. has a mass of 0.268g. What is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm³) by Sunday | Aug 25 | Chemistry WAEC | 0 comments A. 300g B. 200g C. 150g D. 30g E. 15g Correct Answer: Option D – 30g