Asked by carly k

How much heat is lost when 12.55 g of zinc vapor at 907 degrees celsius is cooled to 425 degrees celsius?
Answered by DrBob222
What's the freezing point and boiling point of Zn? You need those to work the problem.
Answered by carly k
boiling point- 907 degrees celsius
melting point- 419 degrees celsius
Answered by DrBob222
At 407 the Zn metal vapor is at the boiling point. First it must be condensed (at 407C) to become a liquid. Cooled to 425 it hasn't frozen yet so it is still a liquid.
q1 = heat released on condensing the Zn vapor.
q1 = mass Zn vapor x heat vaporization/condensation.

q2 = heat released on cooling to 425 C.
q2 = mass Zn x specific heat Zn LIQUID X (Tfinal-Tinitial)

Total heat released is q1 + q2. I don't know the specific heat of Zn metal liquid.
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