Question
Download Solution PDFWhich 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
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 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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