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4 years ago

Why don't metals in column 2 have electron affinity?

1 answer:

5 0

Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion. In other words, the neutral atom's likelihood of gaining an electron.

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After distilling your crude methyl benzoate, you set aside 5.12 grams of the purified ester. You then prepare the grignard reage

marysya [2.9K]

Answer:

Percent yield is 54%

Explanation:

The Grignard reaction is:

Mg + bromobenzene → phenylmagnesium bromide

Moles of Mg are:

2,3g×(1mol/24.3g) = 0.095 moles Mg.

Moles of bromobenzene are:

9,45mL×(1.495g/1mL)×(1mol/157.01g)= 0.0900 of bromobenzene.

The limiting reactant is bromobenzene. That means moles of phenylmagnesium bromide are 0.0900 moles.

To produce triphenyl carbinol you require:

2 phenylmagnesium bromide + methyl benzoate → triphenyl carbinol

Moles of methyl benzoate are:

5.12g×(1mol/136,15g) = 0.0376 moles of methyl benzoate.

The complete reaction of 0.0376 moles of methyl benzoate requires:

0.0376 moles of methyl benzoate× $\frac{2mol PhenylmagnesiumBromide}{1molMethylBenzoate}$ = 0.0752 moles of phenylmagnesium bromide. As you have 0.900 moles of phenylmagnesium bromide, limiting reagent is Methyl benzoate and moles of triphenyl carbinol are 0.0376. In grams:

0.0376 moles of triphenyl carbinol×(260.33g/mol) = 9,79g of triphenyl carbinol <em>-This is the teorethical yield- </em>

Percent yield is the ratio of actual yield to the theoretical yield. That is:

5,3g / 9,79g ×100 = <em>54%</em>

I hope it helps!

3 0

3 years ago

How do i find how many inches are in 2.5 ft

Fittoniya [83]

There are 30 inches in 2.5 just know that a foot is 12 inches so 12 times 2.5 is 30

6 0

4 years ago

Which two structures would provide a positive identification of a animal cell under a microscope

babunello [35]

Lack of cell walls no chloroplasts...hoped that helped

4 0

4 years ago

Read 2 more answers

If I jog 1053 miles in one year and I jog at a pace of 8 miles per hour. How many minutes will I have jogged?

djverab [1.8K]

pretty sure that the answer is 7897.5 minutes

6 0

3 years ago

Which of the following statements are true with respect to enzyme activity? Check all that apply. View Available Hint(s) Check a

tiny-mole [99]

Answer: Enzymes speed up the reaction rate.

Enzymes are regenerated when the reaction is completed.

Enzymes affect the reaction pathway by forming an enzyme-substrate complex.

Explanation:

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

Enzymes are biocatalysts and are highly specific in their action. The specificity of enzymes is due to the presence of some specific regions called as active sites. These active sites form weak bonds with substrate molecules.

The specific binding leads to formation of an enzyme substrate complex which accounts for high specificity of enzyme catalyzed reactions.

Once a proper orientation is achieved, substrate molecules react to form products and products leave the enzyme surface as they do not have any affinity towards the enzyme site and are regenerated at the end.

Enzymes work best in optimum temperature and pH range.The enzyme gets denaturated at high pH and temperature.

5 0

4 years ago