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