Δng
= no of moles of gaseous products - reactants
what will be this quantity's value for the formation of carbon monoxide. it seems to me that 2 values are correct..

Question

Δng
 = no of moles of gaseous products - reactants
 what will be this quantity's value for the formation of carbon monoxide. it seems to me that 2 values are correct..

priyar · Answer

@Rushwr

rushwr · Answer

Okai what is the reaction in the first place ?

priyar · Answer

C + O2 --> CO

rushwr · Answer

First balance the reaction
$$2C _{s} + O _{2} -----------> 2CO$$
Is this it ?

rushwr · Answer

What exactly is in the question ?

priyar · Answer

ya thats what u can balance in two ways..so u get two diff values...do u agree?

rushwr · Answer

yep

priyar · Answer

but they are given as two diff options...which to choose..coz it can have only "one" correct answer...this is my doubt....is it 1 or 1/2 ? why/why not?

priyar · Answer

??

priyar · Answer

actually we are using this value in the eq.:
 $$\Delta H =\Delta U  +\Delta ngRT$$

rushwr · Answer

I think we will have to go by the definition. 
Formation enthaply is the energy change when 1 mole of product is formed. Since  CO is the product,  so we should balance reaction assuming that one mole of CO is formed. 
C(s) + 1/2O2 (g) ----------------------> CO(g) 
So the difference is 1/2

priyar · Answer

ok.. i guess u r right!

priyar · Answer

thanks!

rushwr · Answer

No problem :)