Final answer:
To answer the student's question, the balanced chemical equation must first be provided. Without it, we cannot determine the limiting reagent or calculate the percent excess of reagents left over after the reaction. Identifying the percent excess involves comparing the initial and remaining masses of reactants.
Step-by-step explanation:
To determine the limiting reagent in the reaction of 2.4 g Ag, 0.48 g H₂S, and 0.16 g O₂, we first need to write out the balanced chemical equation for the reaction. However, without the exact reaction, we cannot proceed with the calculation. It is essential to have the balanced chemical equation to know how the reactants combine, and from there, we can calculate the moles of each reactant and determine which is the limiting reagent.
Once the limiting reagent is identified, the mass of the excess reagents can be calculated by determining how much of them reacts with the limiting reagent and then subtracting this mass from the initial mass given. The percent excess is then found by dividing the mass of excess reagent by the initial mass and multiplying by 100%.
Without the complete reaction, we cannot determine the limiting reagent nor the percent excess of the leftover reagents. The information provided is insufficient to answer the student's question, and the student should be asked to provide the missing balanced chemical equation for an accurate calculation of the limiting reagent and percent excess.