You are Here: Home

# Equations

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
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

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

Posted from TSR Mobile
6. Then mass of carbon/ mass of carbon dioxide x 100

Posted from TSR Mobile
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 ^^

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 30, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

### How to get a 1st class degree

Poll
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.