Homework Statement
The activity coefficient of zinc in liquid brass is given (in joules) by the following equation for
temperatures 1000-1500 K:
RT ln γZn = -38,300 x2Cu
where xCu is the mole fraction of copper. Calculate the partial pressure of pure zinc PZn over a
solution of 60 mol%...
Homework Statement
The first law of thermodynamics is about the conservation of internal energy. Why is
entropy not conserved?
Homework Equations
dU = dq + dwexp + dw, where dwe is work in addition (e for ‘extra’) to the expansion work, dwexp.
The Attempt at a Solution
In thermodynamics...
Homework Statement
A refrigerator is operated by a 0.25 horsepower motor. If the interior of the box is to be
maintained at –20ºC against a maximum exterior temperature of 35ºC, what is the maximum
heat leak (in watts) into the box that can be tolerated if the motor runs continuously...