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Question

For 3 moles of ammonia (g), which of the following is/are true?
  1. It contains 12 NA atoms
  2. Volume at STP is 67.2 litres
  3. It has 1.80×1024 molecules
  4. It has 1.80×1025 electrons


Solution

The correct options are
A It contains 12 NA atoms
B Volume at STP is 67.2 litres
C It has 1.80×1024 molecules
D It has 1.80×1025 electrons
(a) 1 mole of NH3 contains 4 moles of atoms
For 3 moles =4×3=12 moles of atoms =12×NA moles of atoms.

(b) Molar volume at STP  = 22.4 L  For 3 moles =22.4×3=67.2 L

(c) 1 mole of ammonia gas contains 6.022×1023 molecules of ammonia.
3 moles of ammonia gas contain 3×6.022×1023 molecules of ammonia.
i.e. 18.066×1023 (or) 1.80×1024 molecules of ammonia.

(d) Total number of electrons in 1 mole of ammonia,
=(No. of electrons in N+No. of electrons in H)×NA
=(7+3×1)×NA
=10×6.022×1023
=6.022×1024
3 moles of ammonia contain 3×6.022×1024 number of electrons.
=18.066×1024 (or) 1.80×1025

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