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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

Calculate the mass percent of copper in CuS, copper(II) sulfide. If you wish to obtain 10.0 g of copper metal from copper(II) sulfide, what mass of CuS (in grams) must you use?

Interpretation Introduction

Interpretation:

The mass percent of copper in CuS and the mass of CuS required to obtain 10g of copper metal are needed to be calculated.

Concept introduction:

  • Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.
  • Equation for finding molar mass from mass of a molecule and number moles is,

    Molarmass=MassingramsNumberofmoles 

  • Molar mass of a molecule can be calculated from its molecular formula by taking the sum of atomic masses of all the elements present in it.
Explanation

The molecule CuS contains 1Cu and 1S  atoms, so the molar mass of the compound can be written as,

1×63.546g/mol(Cu)+1×32.06g/mol(S)=95.606g/mol(CuS)

Mass percent of elements of a compound is the ratio of mass of element to the mass of whole compound and multiplied with hundred.

Therefore,

The mass percent of copper in CuS is,

        63.546g95.606g×100%=66

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