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Chemistry & Chemical Reactivity

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

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

What mass of gold, Au, contains 2.6 × 1024 atoms?

Interpretation Introduction

Interpretation:

The mass of gold from its given number of atoms has to be calculated.

Concept introduction:

  • Molar mass of gold is 197g/mol.
  • Equation for finding number of moles from number of atoms of an atom,

        Numberofmolesofatom=Numberofatoms6.022×1023atoms/mol

  • Conversion formula for number moles of an atom into mass in grams,

    Numberofmoles×Molarmass=Massingrams

Explanation

The amount of gold is given as 2.6×1024atoms.

Molar mass of gold is 197g/mol.

Equation for finding number of moles from number of atoms of an atom,

    Numberofmolesofatom=Numberofatoms6.022×1023atoms/mol

Therefore,

The number of gold is,

    Numberofmolesofgold=2.6×1024atoms6.022×1023atoms/mol=4

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