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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Sodium sulfide, Na2S, is used in the leather industry to remove hair from hides. The Na2S is made by the reaction

Na2SO4(s) + 4 C(s) → Na2S(s) + 4 CO(g)

Suppose you mix 15 g of Na2SO4 and 7.5 g of C. Which is the limiting reactant? What mass of Na2S is produced?

Interpretation Introduction

Interpretation:

The limiting reactant and the mass of Na2S produced in the given reaction have to be determined.

Concept Introduction:

  • Limiting reagent: limiting reagent is a reactant, which consumes completely in the chemical reaction. The quantity of the product depends on this limiting reagent, it can be determined with the help of balanced chemical equation for the reaction.
  • For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
  • Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
Explanation

Balanced chemical equation for the given reaction is,

Na2SO4(s)+4C(s)Na2S(s)+4CO(g)

The mass of Na2S produced can be determined by considering the amount of substance in both the reactant Na2SO4 and C

Therefore the mass of Na2S produced is,

  15gNa2SO4×1molNa2SO4142.04gNa2SO4l×1molNa2S2molNa2SO4×78.0452gNa2S1molNa2S=4

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