Question

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

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 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
$\left(1/36.5\right)$ $X100$ = $2.74$
The percentage composition of Cl will be $100-2.74=97.26$.