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worty [1.4K]
3 years ago
8

Which of the following cannot be separated by physical means?

Chemistry
1 answer:
Elina [12.6K]3 years ago
8 0
The correct answer is D Elements 
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Rank these elements according to first ionization energy. Na, Li, Rb, K
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Ranking these elements from the least to the greatest ionization energy is Rb, K, Na, Li. Ionization energy is defined as the amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated atom to form a cation.
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1-butanol yields 1-bromobutane in the presence of concentrated sulfuric acid and an excess of sodium bromide. CH3CH2CH2CH2OH (l)
Zanzabum

Answer:

The answer to your question is: yield = 56.27%

Explanation:

Data

             CH3CH2CH2CH2OH (l) → CH3 CH2CH2CH2Br

                18.54 ml 1-butanol            15.65 g of 1-bromobutane

% yield = ?

density = 0.81 g/ml

MM = 74 g  1- butanol

MM = 137 g 1-bromobutane

Process

Calculate mass of 1- butanol

              density = mass/volume

              mass = density x volume

              mass = 0.81 x 18.54

              mass = 15.02 g of 1-butanol

Theoretical yield

              74 g of 1- butanol -----------------  137 g of 1-bromobutane

              15.02 g of 1- butanol -------------   x

              x = (15.02 x 137) / 74

              x = 27.81 g of 1-bromobutane

% yield = experimental yield / theoretical yield x 100

% yield = 15.65 / 27.81 x 100

% yield = 56.28

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