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    hi,

    I'm having trouble with a HW on moles, specifically for CO2 and CaCO3

    one question asks 'how many moles of CO2 were collected' and my results are 69cm^3 collected but not sure how to turn it into moles.

    next, 'how many mol of CaCO3 were present in the sample' and my results had 1.25cm^3 but not sure what to do with that.

    help appreciated )
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    69cm^3 of CO2

    Moles = Volume of gas / 24000 (because it's cm^3 not dm^3)

    Assuming for the second part that you've been given a balanced equation the number of moles will depend on the ratio of CO2 to CaCO3?
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    cheers robbie, +rep.
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    (Original post by Robbie c)
    69cm^3 of CO2

    Moles = Volume of gas / 24dm^3

    Assuming for the second part that you've been given a balanced equation the number of moles will depend on the ratio of CO2 to CaCO3?
    I don't get the meaning of ratio for CO2 to CaCO3 though.. :L
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    (Original post by samyakatack)
    I don't get the meaning of ratio for CO2 to CaCO3 though.. :L
    Ignore that; same formula.

    Moles = Volume / 24000 (because it's in cm^3 not dm^3)
 
 
 
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