NCCAA Certification Practice Exam 2025 – Complete Prep Guide

Question: 1 / 400

If the partial pressure of Gas A is 45 mmHg, what is its concentration?

1.5%

2.1%

5.9%

To find the concentration of Gas A when given its partial pressure, we can use the concept of partial pressure in relation to the total pressure of the mixture. The concentration can be expressed as a percentage of the total pressure.

Assuming the total atmospheric pressure is 760 mmHg (standard atmospheric pressure), the concentration can be calculated as follows:

1. Use the formula for concentration:

\[

\text{Concentration} (\%) = \left( \frac{\text{Partial Pressure of Gas A}}{\text{Total Pressure}} \right) \times 100

\]

2. Substitute the values:

\[

\text{Concentration} = \left( \frac{45 \text{ mmHg}}{760 \text{ mmHg}} \right) \times 100

\]

3. Calculate it:

\[

\text{Concentration} = \left( 0.05921 \right) \times 100 \approx 5.9\%

\]

This calculation shows that the concentration of Gas A is approximately 5.9% of the total pressure. Thus, the correct answer is the third option, which reflects the calculated

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