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A sample of damp air in a 1.00 L container exerts a total pressure of 741.0 torr at 20 °C; but when it is cooled to -10 °C, the water vapor freezes to ice with negligible pressure giving a pressure of 607.1 torr. How many molecules of water were present in the gas? A. 4.69 x 10^18 B. 8.44 x 10^19 C. 2.82 x 10^20 D. 7.11 x 10^18 E. 2.14 x 10^21