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QTwo thousand kg of water, initially a saturated liquid at 150 C?,is heated in a

Two thousand kg of water, initially a saturated liquid at 150 C?,is heated in a
closed, rigid tank to a final state where there pressure is 2.5MPa.
Determine the final temperature, the volume of the tank, and sketchthe
process on T-v and p-v diagrams.

Im not sure how to do the interpolation to find the temp 2. Here's what I did from the book that I have the chart shows Tsat 150=4.758bar. Using the chart I find 4.5bar and 5 bar, 4.5 bar yields 147.9 C and 5 bar yields 151.9 C. So then to interpolate I get (147.9-T)/(147.9-151.9)=(4.5-4.758)/(4.5-5.0). And then I get 149.96 whichis not the right answer the right answer is 150.15. So i must have set up the interpolation wrong?
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