a resting adult needs about 125.5 mL of oxygen every min to survive. Assuming the air contains 20% oxygen by volume and that the typical person inhales 50.0mL of air with each breath. calculate the number of breaths the person must take each minute to keep living

Question

anonymous · Answer

First you have to find how much oxygen is in each breath you take, so find the 20 percentage of 50.0mL which is 10.$$50 * 0.2 = 10$$Now you make an equation.. $$b(10) = 125.5$$The variable "b" is for the amount of breaths. Divide by 10 to get "b" alone to find out what amount of breaths are. $$b = 12.55$$I think in this problem you can't breath 12.55 times per minute, so round the number to the nearest whole number and you get 13 number of breaths the person must take each minute to keep living.

anonymous · Answer

Don't forget the measurements

anonymous · Answer

thank you so much!!!

anonymous · Answer

why would I multiply the amount of breaths by 10?

anonymous · Answer

It's not multiplying... it's dividing the "breaths" by ten.
And you divide because you're making an equation to find out what equals the amount of OXYGEN air from the rest of the AIR (in mL) that you are taking.