What is the percentage composition of the two elements present in a molecule of hydrochloric acid?

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Solution

The molecule of hydrochloric acid is represented as HCl. The atomic mass of H is 1u and that of Cl is 35.5u. The percentage composition of H in the molecule will be
$(1 / 36.5)$ $X 100$ = $2.74$
The percentage composition of Cl will be $100 - 2.74 = 97.26$ .

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