Question

A resting adult requires about 240-mL of pure oxygen/min andbreathes about 12 times every minute. If inhaled air contains 21percent oxygen by volume a

Other
ANSWERED
asked 2020-11-20
A resting adult requires about 240-mL of pure oxygen/min andbreathes about 12 times every minute. If inhaled air contains 21percent oxygen by volume and exhaled air is 16 percent oxygen byvolume, what is the volume of air per breath? (Assume that thevolume of inhaled air is equal to that of exhaled air) Comments

Answers (1)

2020-11-21
1. A resting adult requires about240-mL of pure oxygen/min and breathes about 12 times every minute.If inhaled air contains 21 percent oxygen by volume and exhaled airis 16 percent oxygen by volume, what is the volume of air perbreath? (Assume that the volume of inhaled air is equal to that ofexhaled air) oxygen reqd.= 240 ml/mt.
no.of breaths = 12/mt
oxygen reqd./breath \(\displaystyle={\frac{{{240}}}{{{12}}}}\) = 20 ml.
oxygen in inhaled air = 21% \(\displaystyle={\frac{{{21}}}{{{100}}}}={0.21}\)
hence air reqd. to inhale \(\displaystyle={\frac{{{20}}}{{{0.21}}}}={\frac{{{2000}}}{{{21}}}}\)
air exhaled = air inhaled \(\displaystyle={\frac{{{2000}}}{{{21}}}}\)
oxygen in exhaled air = 16%=0.16
oxygen in exhaled air \(\displaystyle={\frac{{{2000}\times{0.16}}}{{{21}}}}={15.24}\)
2. \(\displaystyle{\frac{{{240}}}{{{12}}}}={20}{m}{L}\)
of oxygen/min
20mL=.37x
20mL = .37x (x=total volume per breath)
x=54.05
54.05-34mL=34.05mL
Because there is only 2 sig fig the answer is34mL volume air per breath.
I think thats right.
0
 
Best answer

expert advice

Have a similar question?
We can deal with it in 3 hours

Relevant Questions

asked 2021-08-18
Assume that females have pulse rates that are normally distributed with a mean of 74. 0 beats per minute and a standard deviation of 12.5 beats per minute.
If 1 adult female is randomly selected, find the probability that her pulse rate is greater than 70 beats per minute.
asked 2021-05-09
The dominant form of drag experienced by vehicles (bikes, cars,planes, etc.) at operating speeds is called form drag. Itincreases quadratically with velocity (essentially because theamount of air you run into increase with v and so does the amount of force you must exert on each small volume of air). Thus
\(\displaystyle{F}_{{{d}{r}{u}{g}}}={C}_{{d}}{A}{v}^{{2}}\)
where A is the cross-sectional area of the vehicle and \(\displaystyle{C}_{{d}}\) is called the coefficient of drag.
Part A:
Consider a vehicle moving with constant velocity \(\displaystyle\vec{{{v}}}\). Find the power dissipated by form drag.
Express your answer in terms of \(\displaystyle{C}_{{d}},{A},\) and speed v.
Part B:
A certain car has an engine that provides a maximum power \(\displaystyle{P}_{{0}}\). Suppose that the maximum speed of thee car, \(\displaystyle{v}_{{0}}\), is limited by a drag force proportional to the square of the speed (as in the previous part). The car engine is now modified, so that the new power \(\displaystyle{P}_{{1}}\) is 10 percent greater than the original power (\(\displaystyle{P}_{{1}}={110}\%{P}_{{0}}\)).
Assume the following:
The top speed is limited by air drag.
The magnitude of the force of air drag at these speeds is proportional to the square of the speed.
By what percentage, \(\displaystyle{\frac{{{v}_{{1}}-{v}_{{0}}}}{{{v}_{{0}}}}}\), is the top speed of the car increased?
Express the percent increase in top speed numerically to two significant figures.
asked 2021-02-19
An electric heater is used to heat a room of a volume \(\displaystyle{62}{m}^{{3}}\). Air is brought into the room at \(\displaystyle{5}^{\circ}\) C and is changed completely twice per hour. Heat loss through the walls amounts to approximately 850 kcal/h. If the air is to be maintainedat \(\displaystyle{20}^{\circ}\) C, what minimum wattage must the heater have? (The specific heat of air is about 0.17 kcal/kg*Co.)
asked 2021-03-27
Water is being boiled in an open kettle that has a 0.500-cm-thick circular aluminum bottle with a radius of 12.0cm. If the water boils away at a rate of 0.500 kg/min,what is the temperature of the lower surface of the bottom of the kettle? Assume that the top surface of the bottom of the kettle is at \(\displaystyle{100}^{\circ}\) C.
...