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In which compound is the percent compositionby mass of chlorine equal to 42%?
(1) HClO (gram-formula mass = 52 g/mol)
(2) HClO2 (gram-formula mass = 68 g/mol)
(3) HClO3 (gram-formula mass = 84 g/mol)
(4) HClO4 (gram-formula mass = 100. g/mol)



Answer :

mickymike92

The percentage mass composition of chlorine in HClO₃ is 42%.

What is the percentage mass composition of chlorine in each compound?

Percentage mas of chlorine is calculated as follows:

  • Percentage mass composition = mass of element * 100%/mass of compound

atomic mass of chlorine = 35.5

(1) In HClO (gram-formula mass = 52 g/mol)

Percentage mass composition = 35 * 100% / 52 = 67.3%

(2) In HClO2 (gram-formula mass = 68 g/mol)

Percentage mass composition = 35 * 100%/68 = 51.4%

(3) HClO3 (gram-formula mass = 84 g/mol)

Percentage mass composition = 35 * 100% / 84 = 42%

(4) HClO4 (gram-formula mass = 100. g/mol)

Percentage mass composition = 35 * 100% / 100 = 35.5%

Therefore, the percentage mass composition of chlorine in HClO₃ is 42%.

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