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I have a question and I've shortened it down to: If all the carbon in a sample was converted to give 1.69g of CO2. Whats the percentage of carbon in carbon dioxide?

I'm really stuck and i don't know how to work it out. Please help.
Original post by lummzie
I have a question and I've shortened it down to: If all the carbon in a sample was converted to give 1.69g of CO2. Whats the percentage of carbon in the sample?

I'm really stuck and i don't know how to work it out. Please help.


Fixed it for you.
Original post by lummzie
I have a question and I've shortened it down to: If all the carbon in a sample was converted to give 1.69g of CO2. Whats the percentage of carbon in the sample?

I'm really stuck and i don't know how to work it out. Please help.


you have shortened it too much.

You also need the mass of the sample ...
Reply 3
Avatar for Nurne
Nurne
2
Mr of CO2 = 44
Mr of C = 12
Mass of sample = 1.69
Use Mass = Mr x Moles


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Reply 4
Avatar for Nurne
Nurne
2
Just find the moles then multiply by the Mr of carbon, i.e. 1.69/44 x 12.


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Reply 5
Avatar for Nurne
Nurne
2
Then mass of carbon/ mass of carbon dioxide x 100


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Reply 6
Avatar for nguyen vy
nguyen vy
you can find mole of CO2 : mass of CO2/Mr of CO2(44) = 1.69/44
1 mol CO2 has 1 mol C, so mol of C and CO2 are the same.
Mass of C = nxM = (1.69/44)x12
how percentage of C ? so easier when you know the mass of sample and C
%mC = (mC x100%) / mass of sample
But we don't know the mass of sample ???
Maybe the task is shorten ^^

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