I am doing a lab on enthaply of vaporization of water, I got everything else on the post lab but these two questions, please help.

The deltaHvap data from the handbook reference vary with temp.
1) if your data were perfect, but deltaHvap is not constant, how would this show up in the graph.
2) in making the assumption that the Clausius-Claperyon equation, in the form y=ms+b is linear, what assumption is being made about deltaHvap?

#2. That dHvap is constant at different temperatures.