How many molecules of ammonia are required to form 8 molecules of urea

Options

A. 24
B. 8
C. 16
D. 4

Answer

To determine how many molecules of ammonia are required to form 8 molecules of urea, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Urea Cycle**: The urea cycle is a biochemical process that converts ammonia into urea. This cycle involves several steps and utilizes specific reactants.

2. **Identify the Reactants**: According to the urea cycle, to produce one molecule of urea, the cycle consumes:
- 2 molecules of ammonia (NH₃)
- 1 molecule of carbon dioxide (CO₂)

3. **Calculate for One Molecule of Urea**: From the information above, we can conclude that:
- 2 molecules of ammonia are needed to produce 1 molecule of urea.

4. **Calculate for 8 Molecules of Urea**: To find out how many molecules of ammonia are required for 8 molecules of urea, we can set up a proportion:
- If 2 molecules of ammonia produce 1 molecule of urea, then for 8 molecules of urea:
\[ \text{Ammonia needed} = 2 \text{ molecules of ammonia} \times 8 \text{ molecules of urea} = 16 \text{ molecules of ammonia} \]

5. **Final Answer**: Therefore, to produce 8 molecules of urea, 16 molecules of ammonia are required.

### Conclusion:
The answer to the question is that **16 molecules of ammonia are required to form 8 molecules of urea**.

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