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MHT CET 202622 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
22 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

MHT CET 2026 · 22 April · Morning Shift · Chemistry · Some Basic Concepts of Chemistry

Calculate the total mass and number of molecules present in 3 moles...

Calculate the total mass and number of molecules present in 3 moles of benzene.

Options

  1. ATotal mass = 78 g and number of molecules = 6.022×10236.022 \times 10^{23}
  2. BTotal mass = 156 g and number of molecules = 1.2044×10241.2044 \times 10^{24}
  3. CTotal mass = 334 g and number of molecules = 6.022×10236.022 \times 10^{23}
  4. DTotal mass = 234 g and number of molecules = 1.8066×10241.8066 \times 10^{24}

Correct answer

D. Total mass = 234 g and number of molecules = 1.8066×10241.8066 \times 10^{24}

Step-by-step solution

The molecular formula of benzene is C6H6C_6H_6.

Molar mass of benzene =6×12+6×1=78 g/mol= 6 \times 12 + 6 \times 1 = 78 \text{ g/mol}.

Total mass of 33 moles of benzene =3×78=234 g= 3 \times 78 = 234 \text{ g}.

Number of molecules in 33 moles =3×6.022×1023=18.066×1023=1.8066×1024= 3 \times 6.022 \times 10^{23} = 18.066 \times 10^{23} = 1.8066 \times 10^{24}.

Answer: Total mass = 234 g and number of molecules = 1.8066×10241.8066 \times 10^{24}
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