Suppose that 0.83g of water condenses on a 85.0-g block of iron that is initially at 24 degrees C.
If the heat released during condensation goes only to warming the iron block, what is the final temperature (in degrees C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 Kj/mol)
2007-12-04 05:59:24 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The specific heat of solid iron is also needed: 0.450 J/g•K.
The molar mass of water is also needed:18g/mol.
You also did not specify the water vapor temperature. Assume it is at the whatever the final temperature. That is to say, we only consider the heat released by water condensation.
Heat released: (44.0 kJ/mol)*(0.83g)/ (18g/mol) = 2.03kJ
All the heat are used to heat up the iron block. Thus the final temperature is:
24C + 2.03e3J/((0.450 J/g•K)*(85.0g)) = 77C (answer)
2007-12-05 14:27:35 · answer #1 · answered by Hahaha 7 · 0⤊ 0⤋