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Prelab for Boiling Point and Heat of Vaporization SD

front 1

How is the pressure inside the test tube measured when the liquid reaches its boiling point?

back 1

The pressure in the test tube is the same as the barometric pressure in the room.

front 2

What unit should be found for the temperature?

back 2

Kelvin

front 3

During this experiment, it is necessary to solve for P2 in the Clausius-Clapeyron equation: ln(P2/P1) = ( delta H/R)[(1/T2)-(1/T1)]. Since the right hand side of the equation is able to be determined as a real number (we'll call "z"), the exercise becomes an algebraic problem of this form:

ln(a/b) = z

Screen reader note: ln left parenthesis a over b right parenthesis = z. End of note

Which formula allows for you to solve for the quantity "a"?

HINT: See http://www.sosmath.com/algebra/logs/log4/log47/log47.html for a review of solving logarithmic equations.

back 3

a = bez or a = b times e to the power of z

front 4

Where does the tip of the thermometer need to be when measuring the boiling point of the unknown liquid?

back 4

About half an inch above the level of the liquid.

front 5

Five points are plotted on a graph. They are, roughly, in a straight line. How should the slope of the line of best fit be calculated?

back 5

Find two points that lie on the line of best fit, that are not data points, and calculate the slope using those points.