I'm sorry, but no other information was given for this problem. What information is missing? Maybe that's the first step. We weren't given a formula, and that's part of the help I am seeking. Since we are given a fractionation factor, I assume you manipulate the fractionation equation in some way and calculate delta and ratio values. But the % change is confusing me.
A parcel of water vapor has an initial H value of -70%o. Assume a closed system at 15C (a=1.094). What will the vapor's H value be after 33% of the vapor has condensed to liquid water? What will the H value of the liquid water forming at this time be?