7. The element Cs freezes at 28.40 C, and its molar enthalpy of fusion is Hfus = 2.09 kJ/mol. A. When molten Cs
solidifies to Cs(s) at its normal melting point, is S positive or negative? B. Calculate the value of S when 15.0 g of Cs(l) solidifies at 28.40 C.