Limiting Reagent Qs: NaOH & H2SO4 | C6H6 & Br2

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Discussion Overview

The discussion revolves around determining the limiting reagent in two chemical reactions: the reaction between sodium hydroxide (NaOH) and sulfuric acid (H2SO4), and the reaction between benzene (C6H6) and bromine (Br2). Participants are exploring how to approach the calculations involved in these reactions, particularly focusing on the stoichiometric relationships and the concept of limiting reagents.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a balanced equation for the reaction of NaOH and H2SO4 and asks how to proceed with calculating the grams of water produced, indicating confusion about the limiting reagent.
  • Another participant confirms the balanced equation and emphasizes the importance of the mole ratio between NaOH and H2SO4 in determining the limiting reagent based on the given masses.
  • A participant questions whether to take the ratio of the given grams of each reactant, suggesting a need for clarification on the calculation method.
  • Further clarification is provided that participants should think in terms of moles rather than masses to determine the limiting reagent.
  • Another participant explains that the coefficients in the balanced equation represent the mole ratios, suggesting that understanding these ratios will aid in calculating the number of moles of each reactant and identifying the limiting reagent.

Areas of Agreement / Disagreement

Participants generally agree on the importance of using mole ratios from the balanced equations to identify the limiting reagent, but there is no consensus on the specific steps to take in the calculations, as some participants express confusion about the process.

Contextual Notes

Participants have not fully resolved the mathematical steps required to find the limiting reagent, and there are assumptions about the understanding of mole calculations that may not be universally held.

Who May Find This Useful

This discussion may be useful for students learning about stoichiometry, limiting reagents, and chemical reactions in a homework context.

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Homework Statement


Question 1
How would your solve this? I balanced it now i am stuck. Same with the second problem.
2 NaOH + H2SO4 = Na2SO4 + 2 H2O

If 14.56 g of NaOH was reacted with 13.49 g of H2SO4, how many grams of water would be produced. (Hint What is the limiting reagent?)

Question 2

C6H6 + Br2 = C6H5Br + HBr

Benzene and bromine react to form bromobenzene, as represented by the equation below. If 8.02 g of benzene were reacted with 14.93 g of bromine, how many grams of the non-limiting reagent is unreacted

Homework Equations


The Attempt at a Solution

 
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You correctly balanced the reaction for reactants and products. The reaction uses 2 moles of NaOH for 1 mole of H2SO4. Decide how this ratio compares to the ratio of your given grams of each which are used in the example.
 
do i take the ratio of of each of the given grams?
 
Think in terms of moles, not masses.
 
I believe that what Borek is saying is that the number/coefficient infront of each compound in your balanced equation is to indicate the ratio of moles/particles of each compound. After understanding this, you can try to find the number of moles of NaOH using its mass as given in your question and use the ratio to find the number of moles of H2SO4. Then you can find the number of moles of H2SO4 with its mass as stated in the question and compare the amounts. This should help with finding the limiting reactant.
 

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