How Many Molecules of CO2 and Water Vapour Are in 1 Cubic Metre of Air?

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In summary: How many millions in 5 x 109?In summary, in 1 m3 of atmosphere at sea level, there are 3.80 × 102 molecules of CO2 and 5.00 × 103 molecules of water vapour. With a total of 2.6 × 1025 molecules in the sample, there would be 988 x 1019 molecules of CO2 and 1.3 x 1024 molecules of water vapour.
  • #1
alytal
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One cubic metre (1 m3) of atmosphere at sea level contains 3.80 × 102 ppm of CO2 and 5.00 × 103 ppm of water vapour.
If there is a total of 2.6 × 1025 molecules in 1 m3 of air, calculate how many molecules of CO2 and water vapour there are in 1 m3 of air??

I just starting studying science and i´m stuck with this simple question..please help!
 
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  • #2
alytal said:
One cubic metre (1 m3) of atmosphere at sea level contains 3.80 × 102 ppm of CO2 and 5.00 × 103 ppm of water vapour.
If there is a total of 2.6 × 1025 molecules in 1 m3 of air, calculate how many molecules of CO2 and water vapour there are in 1 m3 of air??

I just starting studying science and i´m stuck with this simple question..please help!

What does 3.80 × 102 ppm mean?
 
  • #3
sjb-2812 said:
What does 3.80 × 102 ppm mean?

it means 380 ppm (parts per million)
 
  • #4
alytal said:
it means 380 ppm (parts per million)

So, if you had a million cubic metres of atmosphere, how much of that would be carbon dioxide?
 
  • #5
sjb-2812 said:
So, if you had a million cubic metres of atmosphere, how much of that would be carbon dioxide?

380 molecules of co2...is that simple the answer??
 
  • #6
alytal said:
380 molecules of CO2...is that simple the answer??

No, not to the question I posed. 1 molecule does not occupy 1 m3.

However, if you had a million molecules, then yes, for this sample you would have 380 molecules of carbon dioxide. Now, how many times larger is 2.6 × 1025, compared to 1 million; or if you prefer how many millions are there in a sample that size?
 
  • #7
sjb-2812 said:
No, not to the question I posed. 1 molecule does not occupy 1 m3.

However, if you had a million molecules, then yes, for this sample you would have 380 molecules of carbon dioxide. Now, how many times larger is 2.6 × 1025, compared to 1 million; or if you prefer how many millions are there in a sample that size?

So... (380 x 1025) / 106 = 988 x 10[19] ??
I´m very bad..i know...
 
  • #8
Not quite, how many millions are there in 2,000,000?
 
  • #9
sjb-2812 said:
Not quite, how many millions are there in 2,000,000?

two...
 
  • #10
How many millions in 5 x 109?
 

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