Calculate the mass fraction of hydrogen in the molecules of hydrochloric and hypochlorous (HClO) acids.

In this case, it is necessary to provide an explanation. the point is that these acids do not exist in 100% concentration. so hydrochloric acid can have a concentration of no more than 35 percent. But in our case, of course, we are talking about the supposed 100% concentration. And it is the content of hydrogen in a chemical compound with a given formula.

And so we calculate the hydrogen content in these acids. We denote this by w (H1) and w (H2)

First, let’s determine the molecular weight of these acids.

m (HCl) = 1 + 36.5 = 36.5

m (HClO) = 1 + 16 + 35.5 = 52.5

1. For HCl.

w (H1) = 1: 36.5 = 0.0274, and in percentage it is 2.27%

w (H2) = 1: 52.5 = 1.0191, and as a percentage it is 1.91%