Correct Answer: Option C

Explanation

Percentage by mass of M = 20.22%
Percentage by mass of Cl = x
100 - 20.22 = 79.78%
Mass given ratio of M
M = \(\frac{20.22}{27}\) = 0.75
Chlorine = \(\frac{79.78}{35.5}\) = 2.24
Divide by the smallest
M = \(\frac{0.75}{0.75}\) = 1
Cl = \(\frac{2.24}{0.75}\) = 3
∴ The formula = MCl\(_3\)

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