Equal masses of iron and sulphur are heated together to form...

Equal masses of iron and sulphur are heated together to form FeS. What fraction of the original mass of excess reactant is left unreacted? $(\mathrm{Fe}=56$, $\mathrm{S}=32$ )
(a) $0.22$
(b) $0.43$
(c) $0.86$
(d) $0.57$

Key Concepts

Stoichiometry

Stoichiometry involves using the balanced chemical equation to relate the amounts (in moles) of reactants and products. It provides the foundation for computing how much of each substance is needed or produced in a chemical reaction based on their mole ratios.

Limiting Reactant

The limiting reactant is the reactant that is completely consumed in a chemical reaction, thereby determining the maximum theoretical amount of product that can be produced. It is identified by comparing the mole ratios of the reactants to those required by the balanced equation.

Excess Reactant

The excess reactant is the substance that remains partially unreacted when the reaction is complete because it is present in a greater amount than needed for the stoichiometric proportions. Understanding which reactant is in excess is important for calculating how much of it is left over after the reaction.

Mass-to-Mole Conversion

Mass-to-mole conversion is a fundamental technique in stoichiometry that involves converting a given mass of a substance into moles using its molar mass. This conversion is critical for comparing reactant amounts and for performing stoichiometric calculations.

Fractional Remainder Calculation

Fractional remainder calculation involves determining the ratio of the unreacted amount of an excess reactant to its original amount. This calculation is essential in assessing the efficiency of a reaction and in quantifying leftover reactants.

Transcript

Please give Ace some feedback