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# Year 10 chemistry help?? :) watch

1. 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 )
2. 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?
3. cheers robbie, +rep.
4. (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
5. (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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