Discussion Overview
The discussion revolves around a limiting reagent calculation involving a reaction between zinc and sulfur. Participants explore how to determine the amount of zinc that remains unreacted after the reaction, considering the quantities of both reactants provided in a homework problem.
Discussion Character
- Homework-related
- Mathematical reasoning
- Conceptual clarification
Main Points Raised
- One participant suggests that the total mass of the reactants is 14.0 g and speculates that half of the zinc would remain unreacted.
- Another participant clarifies that this is a limiting reagent problem and indicates that the amount of zinc that reacts can be determined based on the grams of sulfur available.
- A participant expresses uncertainty about the law of constant composition and seeks guidance on how to find the amount of zinc that does not react.
- There is a question about the compound formed from the reaction, with one participant proposing that it is zinc sulfide.
- Participants discuss the correct formula for zinc sulfide, with one suggesting ZnS2 and another correcting this to ZnS based on the ionic charges of zinc and sulfur.
- One participant calculates the moles of zinc and sulfur, concluding that 0.028 moles of zinc will remain unreacted after the reaction.
- A later reply questions whether the same calculation would apply if the question were about the amount of sulfur remaining unchanged.
- Another participant confirms the previous calculation and notes that all sulfur would theoretically be used up, as it is the limiting reagent.
Areas of Agreement / Disagreement
Participants generally agree on the identification of sulfur as the limiting reagent and the resulting calculation of unreacted zinc. However, there is some uncertainty regarding the correct formula for zinc sulfide and the implications of the limiting reagent concept.
Contextual Notes
Some participants express confusion about the law of constant composition and the stoichiometry of the reaction, indicating a need for further clarification on these concepts.
