Worksheet Mole Ratios Answer Key | Exercises Chemistry | Docsity - Free Printable

Explanation:
Let’s go step by step through the problem using the balanced chemical equation:

N₂(g) + 3 H₂(g) → 2 NH₃(g)

This tells us that:
- 1 molecule of nitrogen (N₂) reacts with
- 3 molecules of hydrogen (H₂) to produce
- 2 molecules of ammonia (NH₃).

So the mole ratio (or molecule ratio, since we’re talking about individual particles here) is:

N₂ : H₂ : NH₃ = 1 : 3 : 2

Now let’s check each part.

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1a. Coefficients:
From the equation:
- N₂ has coefficient 1
- H₂ has coefficient 3
- NH₃ has coefficient 2
✔ This matches what’s written in the answer key.

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2a & 2b. Table calculations:

We’ll use the ratio 1 : 3 : 2 for each “reaction event”.

- For a single reaction:
- N₂ consumed = 1
- H₂ consumed = 3
- NH₃ produced = 2
Ratio = 1 : 3 : 2 ✔

- If the reaction occurred 100 times:
Multiply each by 100:
- N₂ = 1 × 100 = 100
- H₂ = 3 × 100 = 300
- NH₃ = 2 × 100 = 200
Ratio = 100 : 300 : 200 → divide all by 100 → 1 : 3 : 2 ✔

- If the reaction occurred 538 times:
- N₂ = 1 × 538 = 538
- H₂ = 3 × 538 = 1614
- NH₃ = 2 × 538 = 1076
Let’s verify:
538 × 3 = 1614 ✔️
538 × 2 = 1076 ✔️
Ratio = 538 : 1614 : 1076
To reduce: divide all by 538 →
538 ÷ 538 = 1
1614 ÷ 538 = 3
1076 ÷ 538 = 2
So reduced ratio = 1 : 3 : 2 ✔

All entries in the table are correct.

Note: The handwritten “×100” and “×538” annotations show how the numbers were scaled — that’s the right idea.

Final Answer:
The coefficients are 1 for N₂, 3 for H₂, and 2 for NH₃. For any number of reaction events, the amounts scale proportionally, and the simplified ratio is always 1 : 3 : 2.