Some KCl Is Dissolved in Water at 25 ^$\circ$ C, Where It Completely Dissociates

question 58

Multiple Choice

Some KCl is dissolved in water at 25 ^$\circ$ C, where it completely dissociates. The vapor pressure of pure water at 25 ^$\circ$ C is 28.3 mmHg. Estimate the mass in grams of KCl needed per liter of pure water to reduce the vapor pressure of water at 25 ^$\circ$ C by 5%.

• A) 110 g
• B) 120 g
• C) 130 g
• D) 140 g
• E) None of the above

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