Help moles atoms q

Alevelhelp.1

Help idk how to do this I did this but it’s not correct

(edited 1 year ago)

Reply 1

Saeed23

Original post by Alevelhelp.1

Help idk how to do this I did this but it’s not correct

is the answer 'A' then?

(edited 1 year ago)

Reply 2

Teruko

Find number of moles of each in X g
Multiply number of moles by avogadros number to find number of molecules
Multiply by number of carbon atoms per molecule to get total number of carbon atoms in X g

Reply 3

Alevelhelp.1

Original post by Saeed23

is the answer 'A' then?

I got D but it’s supposed to be C (correct ans)

Reply 4

KA_P

Volunteer Team, Clearing and Applications Advisor

Original post by Alevelhelp.1

Help idk how to do this I did this but it’s not correct

How did you try and work this out?
A useful way to work it out may be to find out how many carbon atoms would be in 10g of each, to make t easier to compare

Edit: Maybe find molar mass of the molecule and molar mass of carbon atoms for each option, divide mass of carbon atoms by mass of whole molecule, then multiply that by mole of substance and then multiply that by avogadro's constant

I don't know if that's long winded though

(edited 1 year ago)

Reply 5

Alevelhelp.1

Original post by Teruko

Find number of moles of each in X g
Multiply number of moles by avogadros number to find number of molecules
Multiply by number of carbon atoms per molecule to get total number of carbon atoms in X g

I did 😭 but I got it wrong still

Reply 6

Teruko

Original post by Alevelhelp.1

I did 😭 but I got it wrong still

Hmmmm
Well technically you don't need to multiply by avogadro's number since that'll be the same for all of them
Might have made things confusing with the standard form

Reply 7

Saeed23

well,take out percentage then.divide no.of carbon atoms by total number of atoms,then multiply the mass.so you will get which sample has the highest percentage of carbon atoms..hence,the answer