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Question

Molecular weight of phenol is


A

94.11gmol-1

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B

84.11gmol-1

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C

104.11gmol-1

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D

98gmol-1

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Solution

The correct option is A

94.11gmol-1


Explanation for correct option:

Option (a): 94.11gmol-1

Molecular weight: Molecular weight is the sum of the masses of the atoms in a molecule.

Given compound: Phenol (C6H5OH)

Step 1: Analyzing atomic masses of atoms involved in the compound.

  • Atomic mass ofH=1.00784u
  • Atomic mass ofC=12.011u
  • Atomic mass of O=15.999u

Step 2: Determining molecular weight of the compound.

Molecular mass of C6H5OH

=(AtomicmassofC)x6+(AtomicmassofH)x6+(AtomicmassofO)=(12.011x6)+(1.00784x6)+15.999

=94.11204gmol-1

Hence, the Molecular weight of C6H5OH is 94.11204gmol-1


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