Pressure Formula Homework: Solve 0.9/0.9 +0.1 = 0.9

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Homework Statement


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Homework Equations





The Attempt at a Solution


Okay i have figured out the quality, which is 0.9/0.9 +0.1 = 0.9.
after that I am not sure. What formula/s should I be using??
 

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What is the course? Is the problem from your textbook?
 


its thermodynamics and no its not from my textbook. For part a) i couldn't find a formula or anything that helps me work out the initial temperature. I'm thinking that i have to use the property tables for saturated water, and at 800kPa the saturated temperature is 170.41.would that be correct?