Question

Describe Chemical stoichiometry, The conversion of grams of an element and compound to mole, relation of balanced equation with stoichiometric ratio between reactants and products, limiting reagent and percent yield.

Answer 1

Using a balanced chemical equation to calculate amounts of reactants and products is called stoichiometry.

moles of an element or compound = mass / molar mass

The stoichiometric coefficients are the numbers we use to make sure our equation is balanced. We can make ratios using the stoichiometric coefficients, and the ratios will tell us about the relative proportions of the chemicals in our reaction. You might see this ratio called the mole ratio, the stoichiometric factor, or the stoichiometric ratio. The mole ratio can be used as a conversion factor between different quantities.

Ex : N2(g) + 3H2(g) ----------> 2NH3(g)

1 mole N2 reacts with 3 moles of H2 and produces 2 moles of NH3.

The reactant used up first in a reaction and limits the amount of product formation is called Limiting reagent.

% yield = ( actual yield / theoretical yield ) x 100

theoretical yield is the amount of product that would result if all the limiting reactant is reacted.

actual yield is the amount of product actually obtained in the reaction.