What percent of hydrochloric acid is hydrogen?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

A clearer way to think about this question is to ask: What percent of hydrogen chloride is hydrogen? (Hydrochloric acid results when hydrogen chloride is added to an aqueous solution.)

Hydrogen chloride contains one hydrogen atom and one chlorine atom per molecule. The mass of these two atoms are 1.01...

Unlock
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial

A clearer way to think about this question is to ask: What percent of hydrogen chloride is hydrogen? (Hydrochloric acid results when hydrogen chloride is added to an aqueous solution.)

Hydrogen chloride contains one hydrogen atom and one chlorine atom per molecule. The mass of these two atoms are 1.01 amu for hydrogen and 35.45 amu for chlorine. Thus every individual molecule of hydrogen chloride contains a total mass of 1.01 + 35.45 = 36.46 amu

To find the mass percent of hydrogen in hydrogen chloride, we must divide the weight of the hydrogen atom alone by the weight of the entire molecule.

1.01 / 36.46 = 0.0277

Then we multiply by 100% to find the percentage.

0.0277 x 100% = 2.77%

Thus, 2.77% of the mass of hydrogen chloride is hydrogen.

 

Approved by eNotes Editorial Team