how is mouth to mouth (CPR) beneficial if you’re blowing carbon dioxide into their lungs?

Question

See title

In: Biology

Answer 1

The air you breathe in is 21% oxygen. The air you breathe out is 16.4% oxygen. The air you breathe out still has WAY more oxygen than it has carbon dioxide, and both the air you breathe in and the air you breathe out are equally 78% Nitrogen.

You don’t breathe out Carbon Dioxide; you breathe out a gas that’s got a higher percentage of Carbon Dioxide.