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Dominik [7]
3 years ago
6

How many neutrons are there in 8 molecules of

la1" title=" \frac{19}{9} f2" alt=" \frac{19}{9} f2" align="absmiddle" class="latex-formula">
​
Chemistry
1 answer:
slega [8]3 years ago
4 0

Answer:

128 neutrons

Explanation:

<em>How many neutrons are there in 8 molecules of </em>^{19} _9 F_2<em>?</em>

Step 1: Calculate the number of neutrons in 1 atom of F.

The atomic number (z) of F is 9 and its mass number (A) is 19. We can calculate the number of neutrons using the following expression.

n⁰ = A - Z = 19 - 9 = 10

Step 2: Calculate the number of neutrons in 1 molecule of F₂.

1 molecule of F₂ contains 2 atoms of F. The number of neutrons in  1 molecule of F₂ is:

(8 n⁰/1 atom F) × (2 atom F/1 molecule F₂) = 16 n⁰/1 molecule F₂

Step 3: Calculate the number of neutrons in 8 molecules of F₂

8 molecule F₂ × 16 n⁰/1 molecule F₂ = 128 n⁰

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Explanation :

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where,

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As per question, the molality is same for all the non-electrolyte solution. So, the lowering in freezing point is depend on the k_f only.

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Therefore, Carbon tetrachloride, k_f=29.9^oC/m will show the greatest freezing point lowering.

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