For the reactions, H2(g)+Cl2(g)----->2HCl(g)+xKJ H2(g)+Cl2(g)----->2HCl(l)+yKJ Which one of the following statement is correct? A)x>y B)x<y C)x=y D)more data required
This is quite a difficult question in that we have to make assumptions: I think the answer is
The difference between
Energy is used to boil the liquid.
Note that the fact that exothermic reactions (and this one certainly is) are written as NEGATIVE, is a distractor. Here, because the energy is listed as a product (and not as a separate thermoodynamic property), we should be able to say that
Others may have a different take on this (and they certainly may have a better way of rationalizing the answer!).