In all parts: assume there are no heat losses. a) Suppose molten (liquid) lead,

Question

In all parts: assume there are no heat losses.

a) Suppose molten (liquid) lead, mass ml = 9.68 kg, is at its melting point. The lead is poured into water of mass mw = 705 g and initial temperature Tw = 17.9o C. Find mwb, the amount of the water that boils.
NOTE: Reaching the boiling point is not enough; the question asks for the amount of water that vaporizes as well.
ASSUME: no water evaporates; it only vaporizes at the boiling point.
1 kg

b) A block of silver, mass ms = 1.79 kg, is heated in a furnace to temperature Ts, but remains solid. It is now dropped on a block of ice, mass mi = 425 g and temperature Ti = 0o C. The combination reaches equilibrium at temperature Tf = 24.3 o C. Find Ts, the initial temperature of the silver.
2o C

Explanation / Answer

mass of water evaporated = 0.178 kg
9.68*(665-100)*118=0.705*4187*(100-17.9)+2260000*m
b)
Ts=488.240C

1.79*223*(Ts-24.3)=334000*0.425+0.425*4187*24.3

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