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Chapter 2, Problem 119GQ
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### Chemistry & Chemical Reactivity

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

#### Solutions

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### Chemistry & Chemical Reactivity

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

# The structure of one of the bases in DNA, adenine, is shown here. Which represents the greater mass: 40.0 g of adenine or 3.0 × 1023 molecules of the compound?

Interpretation Introduction

Interpretation: It should be determined that which represents the greater mass, 40.0g of adenine or 3.0×1023 molecules of the compound.

Concept introduction:

• Amountofsubstance(mole)=GivenmassofthesubstanceMolarmass
• Numberofmoles=NumberofmoleculeAvogadroNumber
• Massofthesubstance=Amountofthesubstance×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
Explanation

Adenine one of the nitrogen base in DNA.

Molecular formula of adenine is C5H5N5â€‰â€‰ therefore its molecular formula is 135.13â€‰g/mol since Câ‡’5Ã—12.0107Hâ‡’5Ã—1.00794 Nâ‡’5Ã—14.0067Totallyâ€‰=â€‰135.13â€‰g/mol

The mass of 3.0â€‰Ã—1023 molecules of the compound can be calculated as follows,

MassÂ ofÂ 3.0â€‰Ã—1023moleculesÂ ofÂ adenineâ€‰â€‰â€‰=â€‰â€‰Â 3

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