I've got this question...please help me!?

Here's the question: How could you find out the percentage of oxygen in the air you breathe out? Design an experiment you could perform to do this.

Here's my answer - in steps:

1. Take a deep breath, and blow fully into a balloon.

2. Measure the circumference of the balloon at the longest part in centimeters. Convert to decimeters.

3. Find the radius by putting values into C = 2 蟺 r.

4. Find the volume by putting the radius just calculated into the following equation: V = 4/3 蟺 r^3. This will give you your answer in dm^3 (which is the same as litres).

5. Now I don't know how to continue it. I know that the gas inside the balloon is CO2, so now i need to find the number of moles of each. Carbon has an atomic number of 12, and Oxygen has an atomic number of 32. So somehow i need to write a step that showing what to do to find the percentage of Oxygen only in the balloon.

Please help me, anyone!! Thankyou SO much! =)

I've got this question...please help me!?dream theater

uhuh..good morning Victory,,btw..just woke up..11 am here..lol...

umm..........dunno but take these for consideration ..

that breathing is:

either

conscious or unconscious. ..

Unconsciously, breathing is controlled by specialized centers in the brainstem, which automatically regulate the rate and depth of breathing depending on the body鈥檚 needs at any time..

so there isn't exact amount of O2 we inhale all the time..depending on body needs...

probably if that's it, there isn't an exact percentage maybe of O2 when we exhale, but mostly CO2 we give off few O2 because our body used them all up.

Here's something I've learned too from my Biology last yr...

that:

"The air we exhale is roughly 78% nitrogen, 18% oxygen, 0.96% argon and 4% carbon dioxide. (% by volume) (Note that the amount of exhaled oxygen varies according to the fitness of that particular person)"..

Not all of the oxygen breathed in is converted into carbon dioxide; around 16% of what we breathe out is still oxygen. Also our reliance on this relatively small amount of oxygen can cause overactivity or euphoria in pure or oxygen rich environments.

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hmm

combination of Chem and Biology eh?..

wait..I'll think

finding percentage of O2 right?..hmm

scientists already know what that we exhale oxygen about...18%..but I'll think how they'd found that percent..wait up.

ohhh boy..

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ohh well let me fix these things up. Finally found solution.

do this:

Using the gas laws, you can calculate the amount of each gas is being inhaled and then you can measure the amount of the gas you are interested in again once the person has exhaled. Once you know the amount of gas, in this case O2,

that is present after exhaling you can divide that amount by the total amount inhaled and then multiply that answer by 100 to get your percent of gas

**note that i can't give you exact numbers but only variables.

so you can use variables in your example and you can find the answer.

so maybe after finding the volume of the balloon

try dividing it with somewhat a certain amount you think about the gas in it, then if you find a certain number for the variable you can maybe multiply that by 100 to get it's percent?

ohhh..I ain't accurate but some sort of an idea though

I've got this question...please help me!?performing arts opera theater

You are thinking nicely, however, you have a BIG problem.

We breathe in carbon dioxide as well.

We breathe in nitrogen, oxygen, carbon dioxide, and a host of other gases.

When the body uses the oxygen, it breathes out less oxygen and more carbon dioxide...NOT solely CO2 as you are concluding above.

We breathe in about .4% carbon dioxide and breathe out about 4% carbon dioxide.

Regards,

Mysstere