Paradichlorobenzene, C6H4Cl2, is a component of mothballs. A solution of 2.00 g in 22.5 g of cyclohexane boils at 82.39 ∘C. The boiling point of pure cyclohexane is 80.70 ∘C. Calculate Kb for cyclohexane.

The Kb for cyclohexane is 2.79 °C/m

Explanation:

Step 1: Data given

Mass of Paradichlorobenzene = 2.00 grams

Mass of cyclohexane = 22.5 grams

Boiling point of the solution = 82.39 °C

Boiling point of pure cyclohexane = 80.70 °C

Molar mass of Paradichlorobenzene = 147 g/mol

Step 2: Calculate moles Paradichlorobenzene

Moles Paradichlorobenzene = mass / molar mass

Moles Paradichlorobenzene = 2.00 grams / 147 g/mol

Moles Paradichlorobenzene = 0.0136 moles

Step 3: Calculate molality

Molality = moles Paradichlorobenzene / mass cyclohexane

Molality = 0.0136 moles / 0.0225 kg

Molality = 0.605 molal

Step 4: Calculate Kb

Kb = change in boiling point / molality of solution  

 ⇒ Change in boiling point = 82.39 - 80.70 = 1.69 °C

⇒ molality = 0.605 molal

Kb = 1.69 °C / 0.605 molal = 2.79 °C/m

The Kb for cyclohexane is 2.79 °C/m

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

answer; talc and gypsum;