Chemistry, 24.03.2020 20:15 soccerhannah290

The theoretical yield of 1,2-epoxycyclohexane is grams, when starting with 3.0 grams of trans-2-bromocyclohexanol. (Enter the number using 3 significant figures, i. e. 1.22) Given: 3.0 g of trans-2-bromocyclohexanol FW: 179.05 25 mL of 10% NaOH FW: 40 and density: 1.11 g/mL 1,2-epoxycyclohexane FW: 98.15

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Answer from: freshysans4

$\large \boxed{1.6}$

Explanation:

1. Gather all the information in one place.

Mᵣ: 179.05 40 98.15

BrC₆H₁₀OH + NaOH ⟶ C₆H₁₀O + NaBr + H₂O

m/g: 3.0

V/mL: 25

C/%: 10

ρ/g·mL⁻¹ 1.11

Let's call BrC₆H₁₀OH "R" (reactant) and C₆H₁₀O "P" (product).

They have given us the amounts of two reactants and asked us to calculate the amount of product. This is a limiting reactant problem.

1. Calculate the moles of each reactant

(a) BrC₆H₁₀OH

$\text{Moles of R} = \text{3.0 g R} \times \dfrac{\text{1 mol R}}{\text{179.05 g R}} = \text{0.0168 mol R}$

(b) NaOH

(i) Mass of solution

$\text{Mass} = \text{25 mL} \times \dfrac{\text{1.11 g}}{\text{1 mL}} = \text{27.8 g}$

(ii) Mass of NaOH

$\text{Mass of NaOH} = \text{27.8 g solution} \times \dfrac{\text{10 g NaOH}}{\text{100 g solution}} = \text{2.78 g NaOH}$

(iii) Moles of NaOH

$\text{Moles of NaOH} = \text{2.78 g NaOH} \times \dfrac{\text{1 mol NaOH}}{\text{40 g NaOH}} = \text{0.0694 mol NaOH}$

3. Calculate the moles of C₆H₁₀O you can obtain from each reactant

The molar ratios are all 1:1, so

(a) 0.0168 mol R ⟶ 0.0168 mol P

(b) 0.0694 mol NaOH ⟶ 0.0694 mol P

R is the limiting reactant, because it gives fewer moles of P.

3. Calculate the theoretical yield.

$\text{Mass of P} = \text{0.0168 mol P} \times \dfrac{\text{98.15 g P}}{\text{1 mol P}} = \textbf{1.6 g P}\\\\\text{The theoretical yield of 1,2-epoxycyclohexane is $\large \boxed{\textbf{1.6 g}}$}$

Answer from: Quest

Distance and velocity graph

Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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The theoretical yield of 1,2-epoxycyclohexane is grams, when starting with 3.0 grams of trans-2-bro...