Question

In which compound is the percent composition by mass of chlorine (cl) equal to 42%?.

Answer 1

There are different kinds of compositions. The percentage mass composition of chlorine is 42% in HClO3 (gram-formula mass = 84 g/mol)

What is HClO3 known as?

This HClO3  is known to be popularly called as Chloric acid.

Percentage mass of chlorine is formula:

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

Therefore;

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

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

See full question below.

In which compound is the percent composition by 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)

Learn more about compound from

brainly.com/question/24924853