Chapter 14, Problem 5STP

Interpretation Introduction

Interpretation: The value of vapor pressure at $100C$ needs to be determined.

Concept introduction: Vapor pressure can be defined as pressure exerted by vapor in equilibrium with its liquid state.

Vapor pressure at room temperature ( $25C$ ) is 1.00 atm.

Answer to Problem 5STP

Option “D” is correct.

Explanation of Solution

With increase of temperature kinetic energy of the molecules increases and hence more and more molecules escape the liquid state to vapor state. As the number of molecules in vapor state increases vapor pressure also increases. If at $25C$ vapor pressure is 1.00 atm then at $100C$ vapor pressure must be greater than 1.00 atm.

Conclusion

Option A and B cannot be correct because here vapor pressure is less than 1.00 atm at $100C$ .

Option C is also not correct because 1.00 atm is the vapor pressure at $25C$ .