Question

Calculate total no. of neutrons present in 1.7 g ammonia

Answer 1

Hello Dear.

Here is the answer---

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In one atom of the ammonia,

Number of electron = 10
Number of Protons = 10
Number of Neutrons = Mass Number - Atomic Number
                                 = 17 - 10
                                 = 7 neutrons.

Given---

      Mass of Ammonia = 1.7 grams.
Molecular Mass of Ammonia = 17 grams.

Using the Formula,

  Number of Atoms = (Mass/Molecular Mass) × Avogadro's Number
                               = (1.7/17) × Nₐ
                               = 0.1 × Nₐ


Now,
  ∵ one atom of the Ammonia contains 7 Neutrons.
  ∴ 0.1 Nₐ--------------------------------------- 0.1 Nₐ × 7 Neutrons. 
                                                             = 0.7 Nₐ

 
We know,
 
 Nₐ = 6.022 × 10²³
Thus, Number of Neutrons,

           0.7 Nₐ = 7 × 6.022 × 10²³
                      = 4.2154 × 10²³ Neutrons.


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Hope it helps.


Have a Marvelous Day.

Answer 2

Answer:

Refer to the attachment for your answer