Question

Suppose that 0.95 g of water condenses on a 75.0 g block of iron that is initially at 22 °c. if the heat released during condensation is used only to warm the iron block, what is the final temperature (in °c) of the iron block? (assume a constant enthalpy of vaporization for water of 44.0 kj/mol.)

Answer 1

0.95 g /18.02 g/mol = 0.0527 moles of water. .0527 moles * 44.0 kJ/mol = -2318.8 J specific heat of Fe is 0.449 J/g*°C (75g Fe * 0.449 J/g*°C*22)+2319.64 = 3060.49 3060.49/75*0.449 = 91°C would be the final temperature.