# Thermodynamics of Steam Homework

Here is the question in my homework, but my response does not correspond with the answer given, even though I worked out the answer that was given backwards and it still does not work:

Determine the quantity of heat required, to raise 7.7 kg of water at 90°C, to saturated steam at 1300 kPa and 71.6% dry.

Here is my attempt at a solution:

First, I checked the steam table for water at 90°C. The (hf) value is 376.92. Then I checked the steam table for saturated steam (hg) at 1300 kPa and that is 2787.6.

Then I subtracted hf from hg (2787.6 – 376.92 = 2410.68. Then I multiplied that by 7.7.

(2410.68 X 7.7 = 18562.24). Then I took 71.6 percent of that number which is 13 290.561 KJ required to raise 7.7 kg of water to saturated steam.

The answer the book is giving is 14248.567 KJ required. Is this a typo or am I making a mistake. I would appreciate any help I can get, thank you.

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