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The density of a certain gas is 1.98gdm\(^{-3}\) at s.t.p. What is the molecular mass...

Chemistry
JAMB 2005

The density of a certain gas is 1.98gdm\(^{-3}\) at s.t.p. What is the molecular mass of the gas?

  • A. 44.0 g
  • B. 54.0 g
  • C. 26.0 g
  • D. 31.0 g
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Correct Answer: Option A
Explanation

Density = \(\frac{mass}{volume}\)

Recall that the molar volume of gases at s.t.p = 22.4 dm\(^3\)
∴ 1.98 = \(\frac{mass}{22.4}\)
 Mass = 1.98 x 22.4

 Molecular mass = 44.35g

There is an explanation video available below.


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Explanation Video

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