Explanation

• First, we calculate the number of moles of acetic acid used:

Number of moles of acetic acid = mass of acetic acid / molar mass of acetic acid

Number of moles of acetic acid = 30 g / 60 g/mol = 0.5 moles

Since the reaction is 1:1 between acetic acid and ethyl acetate, the number of moles of ethyl acetate produced is also 0.5 moles.

• Now, we can calculate the theoretical yield of ethyl acetate:

Theoretical yield of ethyl acetate = number of moles of ethyl acetate * molar mass of ethyl acetate

Theoretical yield of ethyl acetate = 0.5 moles * 88 g/mol = 44 grams

• Now, we can calculate the percentage yield:

Percentage yield = (actual yield / theoretical yield) * 100%

Percentage yield = (40 g / 44 g) * 100%

Percentage yield ≈ 90.9%

So, the percentage yield of the ester is approximately 90.9%.

Explanation

In chromatographic analysis, the principle used is adsorption, where the components of a mixture interact with the stationary phase and are separated based on their differing affinities for the stationary phase.

Explanation

Histamine is produced in the body primarily through the decarboxylation of the amino acid histidine.

Explanation

When ultraviolet radiation reacts with chlorofluorocarbons (CFCs), it results in the breakdown of the ozone layer by releasing chlorine radicals Cl° and C° F2Cl.

Explanation

• Among the given options, the process of tautomerism is exemplified by the first reaction: CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O.
• Tautomerism involves the rearrangement of bonds within a molecule, resulting in the formation of structural isomers called tautomers, which readily interconvert.
• In this reaction, the acetic acid (CH3COOH) and ethanol (C2H5OH) undergo tautomerism to form ethyl acetate (CH3COOC2H5) and water (H2O).

Explanation

The stake-shaped band in the infrared (IR) spectrum of the carboxylic acid group typically appears around 1710 cm⁻¹.

Explanation

Salt and water can be recovered from an aqueous salt solution by the process of evaporation.

Explanation

Uranium-235 is used in nuclear power plants for power generation.

 The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods.

Explanation

Alpha rays are made up of positively charged particles.

Explanation

The atomic number or nuclear charge number of a chemical element is the charge number of an atomic nucleus.

(symbol Z) .