Question: Consider a substance X with a Hvap = 20.3 kJ/mol and Hfus = 9.0 kJ/mol. The melting point, freezing point, and heat capacities of both

Consider a substance X with a ∆Hvap = 20.3 kJ/mol and ∆Hfus = 9.0 kJ/mol. The melting point, freezing point, and heat capacities of both the solid and liquid X are identical to those of water.
a. If you place one beaker containing 50 g of X at 10°C and another beaker with 50 g of H2O at 10°C on a hot plate and start heating them, which material will reach the boiling point first?
b. Which of the materials from part a, X or H2O, would completely boil away first?
c. On a piece of graph paper, draw the heating curve for H2O and X. How do the heating curves reflect your answers from parts a and b?

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You will need to compare the heats of fusion and vaporization of substance X H fus 90 kJmol and H vap 203 kJmol with the values for water which are H ... View full answer

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