Jack Sue Gwinnett
New member
In a practise exam, I've been given this question:
" Given the following data:
C(s) + F2 (g) -> CF4 (g) ?H1 = -680 kJ Mol-1
F2(g) -> 2F(g) ?H2 = +158 kJ mol-1
C(s) -> C(g) ?H3 = +715 kJ mol-1
calculate the average bond enthalpy for the C-F bond".
My main confusion is over the first equation, which clearly isn't balanced?
I'm also unsure how I'm isolating the C-F bond. I think I should begin with reversing the CF4 equation, but the balance issue throws me off?
Can anyone guide me to getting the answer? (I don't have a mark scheme currently)
Thanks!
" Given the following data:
C(s) + F2 (g) -> CF4 (g) ?H1 = -680 kJ Mol-1
F2(g) -> 2F(g) ?H2 = +158 kJ mol-1
C(s) -> C(g) ?H3 = +715 kJ mol-1
calculate the average bond enthalpy for the C-F bond".
My main confusion is over the first equation, which clearly isn't balanced?
I'm also unsure how I'm isolating the C-F bond. I think I should begin with reversing the CF4 equation, but the balance issue throws me off?
Can anyone guide me to getting the answer? (I don't have a mark scheme currently)
Thanks!