# Approximatly 5% of each exhaled breath is carbon dioxide

• matt_crouch
In summary, the conversation discusses the calculation of the difference in mass between an inhaled breath and an exhaled breath, based on the information that 5% of each exhaled breath is carbon dioxide and that 20% of the air breathed in is oxygen. The conversation also mentions using the equation n=m/mr to determine the weight of the gases involved, and raises questions about the need for additional information such as molar mass.
matt_crouch

## Homework Statement

In normal breathing conditions approximatly 5% of each exhaled breath is carbon dioxide. Given this informartion and neglecting any difference in water-vapor content estimate the typical difference in mass between an inhaled breath and an exhaled breath. assume one lungs capacity is about half a litre and that 20 % of the air that is breathed in is oxygen.

n=m/mr

## The Attempt at a Solution

not really sure where to start for this one

It tells you how much oxygen is breathed in on each breath
5% of the total amount of air is turned into CO2
So work out how much oxygen is turned into CO2

Then we can work out how much this volume of O2 and CO2 weigh

How do you work out how much the volume of these gases weigh? Would you need to look up extra information such as molar mass of 02 and C02?

mgb_phys said:
It tells you how much oxygen is breathed in on each breath
5% of the total amount of air is turned into CO2
So work out how much oxygen is turned into CO2

Then we can work out how much this volume of O2 and CO2 weigh

1/4 of the O2 is turned into CO2 and I'm not sure what i have to do now?

## What is the significance of 5% of exhaled breath being carbon dioxide?

The presence of carbon dioxide in our exhaled breath is important for maintaining a balance in our body's pH levels. It helps regulate our respiratory and cardiovascular systems and is a byproduct of our body's metabolism.

## How is the amount of carbon dioxide in exhaled breath measured?

The amount of carbon dioxide in exhaled breath is typically measured using a device called a capnometer or capnograph. These devices detect the concentration of carbon dioxide in the breath and display it as a numerical value.

## Why is it important to monitor the amount of carbon dioxide in exhaled breath?

Monitoring the amount of carbon dioxide in exhaled breath is important for identifying potential respiratory and metabolic issues. It can also be used to track the effectiveness of treatments for conditions such as asthma, COPD, and metabolic disorders.

## Does the percentage of carbon dioxide in exhaled breath vary among individuals?

Yes, the percentage of carbon dioxide in exhaled breath can vary among individuals based on factors such as age, health status, and physical activity level. However, the average percentage is around 5%.

## Can the amount of carbon dioxide in exhaled breath be affected by environmental factors?

Yes, environmental factors such as air pollution, altitude, and temperature can affect the amount of carbon dioxide in exhaled breath. For example, at higher altitudes, the percentage of carbon dioxide in the breath may be lower due to a decrease in oxygen levels in the air.

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