Quiz & Worksheet - Working with Mole-to-Mole Ratios | Study.com - Free Printable

Let’s solve each question one by one, step by step.

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Question 1:

We are given the balanced chemical equation:

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

We need to find which mole ratio is NOT appropriate.

In a balanced equation, the coefficients tell us the mole ratios between reactants and products.

So from the equation:

- 6 moles CO₂ react with 6 moles H₂O → so ratio 6:6 (or 1:1) is correct.
- 6 moles CO₂ produce 1 mole C₆H₁₂O₆ → so 6:1 is correct.
- 6 moles CO₂ produce 6 moles O₂ → so 6:6 (or 1:1) is correct.
- 6 moles H₂O produce 1 mole C₆H₁₂O₆ → so ratio should be 6:1, NOT 6:6.

Wait — let’s check the last option:
“6 moles H₂O / 6 moles C₆H₁₂O₆” → that would mean 6 moles of water make 6 moles of glucose? But according to the equation, 6 moles of water make only 1 mole of glucose.

So this ratio is wrong. It should be 6 moles H₂O : 1 mole C₆H₁₂O₆.

Therefore, “6 moles H₂O / 6 moles C₆H₁₂O₆” is NOT appropriate.

✔ Correct answer for Q1: 6 moles H₂O / 6 moles C₆H₁₂O₆

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Question 2:

Reaction: N₂ + 3H₂ → 2NH₃

We want to know how many moles of N₂ are needed to produce 18 moles NH₃.

From the equation:
→ 1 mole N₂ produces 2 moles NH₃

So set up a proportion:

If 1 mol N₂ → 2 mol NH₃
Then ? mol N₂ → 18 mol NH₃

Divide 18 by 2 = 9

So we need 9 moles of N₂

✔ Correct answer for Q2: 9

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Question 3:

Reaction: 2Na + Cl₂ → 2NaCl

We want to know how many moles of Na are needed to produce 15 moles of NaCl.

From the equation:
→ 2 moles Na produce 2 moles NaCl → so it’s a 1:1 ratio!

That means:
To make 2 moles NaCl → need 2 moles Na
To make 1 mole NaCl → need 1 mole Na
To make 15 moles NaCl → need 15 moles Na

✔ Correct answer for Q3: 15

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Final Answer:
1. 6 moles H₂O / 6 moles C₆H₁₂O₆
2. 9
3. 15