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Year 10 chemistry help?? :)

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 :smile:

)

Reply 1

Robbie c

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?

(edited 12 years ago)

cheers robbie, +rep.

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?