Using the steam tables, determine the enthalpy change for 1lb of water:
condensing a saturated vapor at 212 fahrenheit and 1 atm abs.

change in enthalpy for 1 lb water is - 970.10872 Btu

Explanation:

Given data:

weight of water 1 lb

pressure 1 atm

temperature 212 Fahrenheit

From steam table

initial enthalpy

final enthalpy

change in enthalpy is given as

change in enthalpy for 1 lb water is - 970.10872 Btu

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.