Chapter 2, Problem 109GQ

### Chemistry & Chemical Reactivity

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

Chapter
Section

### Chemistry & Chemical Reactivity

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

# In each case, decide which represents more mass:(a) 0.5 mol of Na, 0.5 mol of Si, or 0.25 mol of U(b) 9.0 g of Na, 0.50 mol of Na, or 1.2 × 1022 atoms of Na(c) 10 atoms of Fe or 10 atoms of K

(a)

Interpretation Introduction

Interpretation:

For the given set of atoms, the atom having most weight is needed to be calculated.

Concept introduction:

Molar masses of Na, Si, U, Fe and K are 23g, 28g, 238g, 55.8g and 39g respectively.

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

Numberofmoles=MassingramsMolarmass

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

Numberofatoms=numberofmolesofatom×6.022×1023atoms/mol

Explanation

Conversion formula for number moles of an atom into mass,

Â Â Â Â Numberâ€‰ofâ€‰molesâ€‰Ã—Molarâ€‰ma

(b)

Interpretation Introduction

Interpretation:

For the given set of atoms, the atom having most weight is needed to be calculated.

Concept introduction:

Molar masses of Na, Si, U, Fe and K are 23g, 28g, 238g, 55.8g and 39g respectively.

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

Numberofmoles=MassingramsMolarmass

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

Numberofatoms=numberofmolesofatom×6.022×1023atoms/mol

(b)

Interpretation Introduction

Interpretation:

For the given set of atoms, the atom having most weight is needed to be calculated.

Concept introduction:

Molar masses of Na, Si, U, Fe and K are 23g, 28g, 238g, 55.8g and 39g respectively.

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

Numberofmoles=MassingramsMolarmass

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

Numberofatoms=numberofmolesofatom×6.022×1023atoms/mol

(c)

Interpretation Introduction

Interpretation:

For the given set of atoms, the atom having most weight is needed to be calculated.

Concept introduction:

Molar masses of Na, Si, U, Fe and K are 23g, 28g, 238g, 55.8g and 39g respectively.

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

Numberofmoles=MassingramsMolarmass

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

Numberofatoms=numberofmolesofatom×6.022×1023atoms/mol

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