Belford: Raoult's Law

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Raoult's Law
Chapter
	Dr. Robert Belford & Xiaomin Tu

Question 1
<nolayer> </nolayer>

The vapor pressure of water at room temperature is 23.8 torr. If 90g of glucose (C₆H₁₂O₆) were added to 500.0 g of water, what will be the vapor pressure of the solution.

(A) 23.3torr

(B) 24.3torr

(C) 25.3torr

(D) 26.3torr

Hint

Your response

Not answered yet

Question 2
<nolayer> </nolayer>

What would be the vapor pressure when 32.0g of naphthalene(C₁₀H₈) are dissolved in 1000g of benzene (C₆H₆) at 25⁰C? The vapor pressure of benzene at 25⁰C is 110 torr.

(A) 106.9torr

(B) 107.9torr

(C) 108.9torr

(D) 109.9torr

Hint

Your response

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Question 3
<nolayer> </nolayer>

The vapor pressure of water at 30.0⁰C is 31.8 torr. How many moles of glucose C₆H₁₂O₆ need to be added into 150.0 g of water to lower the vapor pressure to 29.0 torr?

(A) 0.6moles

(B) 0.7moles

(C) 0.8moles

(D) 1.0moles

Hint

Your response

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Question 4
<nolayer> </nolayer>

When 90.0g of the solid were added to 50.0g of water, the vapor pressure of the solution dropped from 17.4 torr to 12.4 torr. Determine the molecular mass of the compound.

(A) 77.4g/mol

(B) 78.4g/mol

(C) 79.4g/mol

(D) 80.4g/mol

Hint

Your response

Not answered yet

Question 5
<nolayer> </nolayer>

What is the vapor pressure of a 10% aqueous solution of sucrose (C₁₂H₂2O₁₁) at 20⁰C? The vapor pressure of water at 20⁰C is 17.5 torr.

(A) 15.4torr

(B) 16.4torr

(C) 17.4torr