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Which of the following is the correct definition of mole? (A) It is equal to the gram atomic mass of the substance (B) It contains 6.022 × 1020 atoms of the given substance (C) It is equal to the gram molecular weight of the substance (D) It contains 6.022 × 1023 molecules of the given substance

Which of the following is the correct definition of mole? (A) It is equal to the gram atomic mass of the substance (B) It contains 6.022 × 1020 atoms of the given substance (C) It is equal to the gram molecular weight of the substance (D) It contains 6.022 × 1023 molecules of the given substance Correct Answer Options (A) (C) and (D)

The correct answer is Options (A) (C) and (D).

Key Points

  • Mole
    • The amount of any substance that has the same basic unit (molecule/atom/ion) as the atom in 12 grams of carbon-12" is called a mole. 
    • It is equal to the gram atomic mass of the substance, equal to the gram molecular weight and 6.022x1023 molecules of the substance. Hence, statements 1, 2, and 4 are correct and Statement 2 is not correct.
    • It is also known as Avogadro Constant and is denoted by NA.
    • SI unit of Mole is mol.
    • The word mole was coined by Wilhelm Ostwald, was a German chemist.
    • In 1909 Ostwald was awarded the Nobel Prize for Chemistry for his work on catalysis, chemical equilibria, and reaction velocities.

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