Correct Answer: Option C

Explanation

Imole Q occupies 22400 cm3
x mole occupies 800 cm3
x = \(\frac{800 x 1}{22400}\)
= 0.036mol

Molar mass = Mass ÷ Mole 

                    = 1 ÷ 0.036

 Molar mass ≈ 28 g/mol

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