A solution contains 0.102 mol Ca(NO₃)₂ and 0.927 mol H₂O. Calculate the vapor pressure of the solution at 55 °C.

The vapor pressure of pure water at 55 °C is 118.1 torr. (Assume that the solute completely dissociates.)

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SORT You are given the number of moles of each com- ponent of a solution and asked to find the vapor pressure of the solution. You are also given the vapor pressure of pure water at the appropriate temperature. STRATEGIZE To solve this problem, use Raoult's law as you did in Example 14.6. Calculate Xsolvent from the given amounts of solute and solvent. GIVEN: 0.102 mol Ca(NO3)2 0.927 mol H₂0 PH₂0 FIND: Psolution = 118.1 torr (at 55 °C) CONCEPTUAL PLAN XH,o PH,o P solution P solution = XH₂OPH₂0