Atomic mass of Carbon is 12 and that of Helium is 4. State which of the following statements is true for 1 mole of each of the elements?

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RRB ALP Previous Paper 10 (Held On: 10 Aug 2018 Shift 1)
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  1. 1 mole of Carbon will contain 3 times more atoms than 1 mole of Helium.
  2. 1 mole of Helium will contain 3 times more atoms than 1 mole of Carbon.
  3. 1 mole of Carbon will contain one-third the number of atoms present in 1 mole of Helium.
  4. 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium.

Answer (Detailed Solution Below)

Option 4 : 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium.
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  • The correct answer is option 4, i.e., 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium.
  • Out of the given options, the correct statement is: 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium.
  • A mole is the SI unit of measurement for the amount of substance
  • 1 mole = 6.022 x 1023
  • 1 mole of any particle has 6.022 x 1023 of that particle. For eg: 1 mole of atom = 6.022 x 1023 atoms, 1 mole of molecule = 6.022 x 1023 molecule, etc.
  • 6.022 x 1023 is known as the Avagadro number.
  • A mole does not depend on the atomic number, it's just a unit.
  • Thus, 1 mole of Carbon and 1 mole of Helium will contain the same number of atoms i.e. 6.022 x 1023 atoms.
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