If the relative rate of diffusion of a gas is \(0.25\) and that of \(\mathrm{Cl}_{2}\) under the same condition is \(0.20\); calculate the relative molecular mass of the gas. 3. A solution of calcium bromide contains \(20 \mathrm{~g} / \mathrm{dm} 3\). What is the molar concentration of calcium bromide relative to bromide ions? \([\mathrm{Ca}=40, \mathrm{Br}=80]\)

A. \(22.7\)
B. \(45.4\)
C. \(68.1\)
D. \(90.8\)  

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Correct Answer: D