In a government lab, 827 g of chlorobenzene (C6H5Cl) is reacted with 345 g of chloral (C2HOC13). If the actual yield of DDT (C14H9C15) is 464 g, then what is the percent yield?
2C6H5CI+CHOC13 --> C14H2Cl5 + H20

Percent yield = 55.9%

Explanation:

To solve this question we must find the moles of the reactants in order to find limting reactant. Using the chemical equation and limiting reactant we can find the moles of DDT assuming a 100% of yield (Theoretical Yield). As percent yield is:

Percent Yield = Actual yield (464g) / Theoretical Yield * 100

We can find percent yield as follows:

Moles chlorobenzene- Molar mass: 112.56g/mol-

827g * (1mol / 112.56g) = 7.35 moles

Moles chloral -Molar mass: 147.3877g/mol-

345g * (1mol / 147.3877g) = 2.34 moles

For a complete reaction of 2.34 moles of chloral are required:

2.34moles CHOCl3 * (2mol C6H5Cl / 1mol CHOCl3) = 4.68 moles Chlorbenzene. As there are 7.35 moles, Chlorobenzene is the excess reactant and chloral the limiting reactant.

The theoretical moles of DDT produced = Moles DDT = 2.34 moles. The mass is (Molar mass DDT: 354,49 g/mol):

2.34mol * (354.49g / mol) = 830g DDT = Theoretical mass

Percent yield = Actual yield (464g) / Theoretical Yield (830g) * 100

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation: