Determine the mass of excess reactant remaining when 20.30 grams of ZnS and are reacted with 36.8 grams of oxygen would be 1.517g
Evaluating :
2ZnS + 3O2 → 2ZnO + 2SO2
1.517g
20.30g ZnS( 1 mol / 97.474 g) = 0.208 mol ZnS
36.8 g 3O2 (3 mol / 32g) = 3.45 mol O2
The limiting reactant would be Zinc oxide since it is consumed completely in the reaction. The excess reactant would be zinc.
Excess Zinc = 0.208 mol ZnS - (3.45 / 2) mol ZnS = 1.517 mol Zn left
Excess Reactant
When reactants are allowed to react to generate products, some reactants will be completely consumed while others will be left behind after the reaction is completed. The surplus reactants are referred to as excess reactants since they are in excess of what was necessary. As a result, an excess reactant can be defined as a chemical that is not totally consumed in the reaction.
Limiting and Excess Reactants :
limiting reactants are those that limit the amount of other reactants that can combine and the final number of products that can be generated in a chemical process. In a chemical reaction, limiting reactants finish before the other reactants.
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