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# Equations watch

1. 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?

2. (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?

Fixed it for you.
3. (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?

you have shortened it too much.

You also need the mass of the sample ...
4. Mr of CO2 = 44
Mr of C = 12
Mass of sample = 1.69
Use Mass = Mr x Moles

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5. Just find the moles then multiply by the Mr of carbon, i.e. 1.69/44 x 12.

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6. Then mass of carbon/ mass of carbon dioxide x 100

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7. 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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