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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

What mass of lime, CaO, can be obtained by heating 125 kg of limestone that is 95.0% by mass CaCO3?

CaCO3 (s) → CaO(s) + CO2(g)

Interpretation Introduction

Interpretation:

The mass of lime CaO obtained in the given reaction has to be determined.

Concept introduction:

  • The relation between the number of moles and mass of the substance is,

     Numberofmole=Mass in gramMolar mass

  Mass in gram ofthesubstance=Numberofmole×Molarmass

  • The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
  • 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.
  • Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
  • Amountof substance=Concentrationofsubstance×volumeofthesubstance
  • Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
Explanation

Balanced chemical equation for the given reaction is,

  CaCO3(s)CaO(s)+CO2(g)

From the balanced chemical equation it is clear that lime stone (CaCO3) and lime (CaO) react in 1:1ratio.

From the mass percent of lime stone its actual mass involved in this reaction can be calculated.

Thus,

  95% of 125 kg CaCO3 =95100 ×125 =118.75 kg CaCO3

The amount (moles) of CaCO3 available can be determined as follows,

  Amount of CaCO3 =118750gCaCO3100g/mol = 1187

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