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    At sea level there is approx 2.6 x10^25 molecules in M^-3 of atmosphere. One of the gases making up atmosphere has a concentration of 2.47 x 10^22 molecules m-3. What is the concentration of this gas in parts per million?

    I have no idea?

    Can anyone help?
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    (Original post by Lambert87)
    At sea level there is approx 2.6 x10^25 molecules in M^-3 of atmosphere. One of the gases making up atmosphere has a concentration of 2.47 x 10^22 molecules m-3. What is the concentration of this gas in parts per million?

    I have no idea?

    Can anyone help?
    Do you know how to find out the concentration as a fraction (or decimal)?
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    (Original post by Lambert87)
    At sea level there is approx 2.6 x10^25 molecules in M^-3 of atmosphere. One of the gases making up atmosphere has a concentration of 2.47 x 10^22 molecules m-3. What is the concentration of this gas in parts per million?

    I have no idea?

    Can anyone help?
    So, this gas has 2.47 x10^22 molecules, out of 2.60 x10^25.

    Percentages are "parts per hundred".

    Find what (2.47e22)/(2.60e25) is as a fraction, when the denominator is one million.

    Spoiler:
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    The answer is 950 ppm, if you've done it correctly.
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    Legends.. Thanks both


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