
The vapor pressure of water at is . glucose is dissolved in water. What is the vapor pressure (in mm) of the resultant solution?
A. 19
B. 19.602
C. 19.402
D. 19.202
Answer
511.2k+ views
Hint: Vapor pressure of a solution can be found using Raoult’s Law. According to this law, the partial vapor pressure of a component in a mixture is equal to the vapor pressure of the pure component at that temperature multiplied by its mole fraction in the mixture.
Formula used:
vapor pressure of solution
vapor pressure of pure component
mole fraction
Where no. of moles of pure component (water)
Where no. of moles of glucose
Complete answer:
Vapor Pressure: It is a measure of the tendency of a material to change into gaseous or vapor state.
Mole fraction: It is defined as the unit of amount of constituents divided by the total amount of all constituents in a mixture.
Given,
(number of moles of glucose)
(number of moles of water)
Molar mass for water (for (for O)
So,
.
So, the correct answer is “Option B”.
Additional Information:
Raoult’s law was given by Francois-Marie Raoult in 1887. It is used to estimate the contribution of individual components of a liquid or solid mixture to the total pressure exerted by the system, especially for discrete mixtures where the quantity of each component is known.
Note:
Study about Raoult’s Law, mole fraction and the partial vapor pressure of mixtures. Ideal Solution is the solution in which molecular interactions between solute molecules are absolutely zero, and it follows Raoult’s Law. Positive Deviation from Raoult’s Law occurs when the vapor pressure of the components is greater than what is expected in Raoult’s Law. Negative Deviation in Raoult’s Law means that we find a lower than expected vapor pressure for the solution.
Formula used:
Where
Where
Complete answer:
Vapor Pressure: It is a measure of the tendency of a material to change into gaseous or vapor state.
Mole fraction: It is defined as the unit of amount of constituents divided by the total amount of all constituents in a mixture.
Given,
Molar mass for water
So,
So, the correct answer is “Option B”.
Additional Information:
Raoult’s law was given by Francois-Marie Raoult in 1887. It is used to estimate the contribution of individual components of a liquid or solid mixture to the total pressure exerted by the system, especially for discrete mixtures where the quantity of each component is known.
Note:
Study about Raoult’s Law, mole fraction and the partial vapor pressure of mixtures. Ideal Solution is the solution in which molecular interactions between solute molecules are absolutely zero, and it follows Raoult’s Law. Positive Deviation from Raoult’s Law occurs when the vapor pressure of the components is greater than what is expected in Raoult’s Law. Negative Deviation in Raoult’s Law means that we find a lower than expected vapor pressure for the solution.
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