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2 years ago

Choose the right reagent or series of reagents from the ones listed below to prepare 2-methyl-3-hexyn-2-ol from acetylene.

Chemistry

1 answer:

Feliz [49]2 years ago

7 0

2-methyl-3-hexyn-2-ol can be prepared from Acetylene by treating Acetylene with NaNH₂ followed by CH₃CH₂Br, then treating the intermediate with NaNH₂ followed by acetone and then doing aqueous workup. NaNH₂ acts as base and abstracts proton from acetylene as the terminal alkynes are acidic in nature. While acetone on reduction gives tertiary alcohol.

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Identify the term that applies to each definition.

Illusion [34]

Answer:

A. Reference blank

B. Cuvettes

C. Transmittance

D. Absorbance

E. Wavelength

Explanation:

A reference blank is a sample prepared using the solvent and any other chemicals in the sample solutions, but not the absorbing substance.

A square-shaped container, typically made of quartz, designed to hold samples in a spectrophotometer is known as Cuvettes.

A measurement of the amount of light that passes through a sample or percentage of light transmitted by the sample, with the respective intensities of the incident and transmitted beams is called Transmittance.

The measurement of the amount of light taken in by a sample is known as Absorbance

The wavelength is also the distance travelled by the wave during a period of oscillation. In spectrophotometry, the unit is inversely proportional to energy and commonly measured in nanometers

6 0

2 years ago

The reaction pcl3(g)+cl2(g)←−→pcl5(g) has kp=0.0870 at 300 ∘c. a flask is charged with 0.50atmpcl3, 0.50atmcl2, and 0.20atmpcl5

bearhunter [10]

The question only asks regarding the direction of the equilibrium reaction. The general expression of Kp is:

Kp = [PCl₅]/[PCl₃][Cl₂]

The higher the value of K (greater than 1), the more spontaneous the reaction (favors the product side). Otherwise, it favors the reactant side. Since Kp = 0.087 which is less than 1, the direction favors the forward reaction towards the product side.

6 0

2 years ago

Read 2 more answers

To conclude through reasoning from something known or assumed is to ___.

sp2606 [1]

Is it to hypothesize?

6 0

2 years ago

Read 2 more answers

Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, 7.9 grams of SO3 are produced by the reaction of

shutvik [7]

Answer:

79%

Explanation:

1) Balanced chemical equation:

2S + 3O₂ → 2SO₃

2) Mole ratio:

2 mol S : 3 mol O₂ : 2 mol SO₃

3) Limiting reactant:

Number of moles of O₂

n = 6.0 g / 32.0 g/mol = 0.1875 mol O₂

Number of moles of S:

n = 7.0 g / 32.065 g/mol = 0.2183 mol S

Ratios:

Actual ratio: 0.1875 mol O₂ / 0.2183 mol S =0.859

Theoretical ratio: 3 mol O₂ / 2 mol S = 1.5

Since there is a smaller proportion of O₂ (0.859) than the theoretical ratio (1.5), O₂ will be used before all S be consumed, and O₂ is the limiting reactant.

4) Calcuate theoretical yield (using the limiting reactant):

0.1875 mol O₂ / x = 3 mol O₂ / 2 mol SO₃

x = 0.1875 × 2 / 3 mol SO₃ = 0.125 mol SO₃

5) Yield in grams:

mass = number of moles × molar mass = 0.125 mol × 80.06 g/mol = 10.0 g

6) Percent yield:

Percent yield, % = (actual yield / theoretical yield) × 100

% = (7.9 g / 10.0 g) × 100 = 79%

6 0

2 years ago

A student measured the specific heat of water to be 4.29 J/gC. The literature value of the specific heat of water is 4.18J/gC. H

natita [175]

Answer:

2.44 %

Explanation:

Given that,

The calculated value of specific heat of water to be 4.29 J/g°C

The actual value of the specific heat of water is 4.18J/g°C

We need to find the percentage error of the student

$\text{Percentage error}=\dfrac{|\text{actual value-calculated value}|}{\text{actual value}}\times 100\\\\\%=\dfrac{4.18-4.29}{4.49}\times 100\\\\\%=2.44$

Hence, the student's percent error is 2.44 %.

6 0

2 years ago