Chemistry, 27.12.2019 02:31 sophiebeardsley94

The intensity of the molecular fluorescence of a compound is related to all of these parameters except. a.) the power of the excitation radiation b.) the fluorescence quantum efficiency of the fluorescing molecule c.) the molar mass of the compound d.) the absorptivity of the compound

Answers: 3

Show answers

Answers

Answer from: taee67

a) excitation radiation

Explanation:

the fluorescence quantum efficiency of the fluorescing molecule:

Molecular structure and its chemical environment influence whether a substance will fluoresce and the intensities of these emissions. The quantum yield or quantum efficiency is used to measure the probability that a molecule will fluoresce or phosphoresce. For fluorescence and phosphorescence is the ratio of the number of molecules that luminescent to the total number of excited molecules. For highly fluoresce molecules, the quantum efficiency approaches to one.Molecules that do not fluoresce have quantum efficiencies that approach to zero.

the molar mass of the compound

Influence of a halogen substitution decreases fluorescence as the molar mass of the halogen increases. This is an example of the “heavy atom effect” which suggest that the probability of intersystem crossing increases as the size of the molecule increases. As the molar mass of the substituted compound increases, the relative intensity of the fluorescence decreases.

The absorptivity of the compound

he molar absorptivity, which measures the probability that a transition will occur

Answer from: Quest

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 : $4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

equation 2 : $2x (s) + 3cl_{2} (g) \rightarrow 2xcl_{3} (s) h rxn = -800 kj/mol$

equation 3 : $4xcl_{3} (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) + 6cl_(2} h rxn = -200 kj/mol$

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 : $4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+800) \times 2 kj/mol$

let us add equation 1 & 4

$4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

$4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+1600) kj/mol$

$4xcl_{3} )s) + 3o_{2} \rightarrow 2x_{2}o_{3} (s) + 6cl_{2} (g) h rxn = (+1000) kj/mol$

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

Answer from: Quest

It is a ok i know i have a brain functioning well.

Another question on Chemistry

Chemistry, 22.06.2019 07:40

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Answers: 3

Answer

Chemistry, 22.06.2019 08:30

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Answers: 1

Answer

Chemistry, 22.06.2019 19:30

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?

Answers: 2

Answer

Chemistry, 22.06.2019 22:30

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

Answers: 2

Answer

You know the right answer?

The intensity of the molecular fluorescence of a compound is related to all of these parameters exce...

Questions