Question

As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches:

• A. zero
• B. unity
• C. infinity
• D. an indeterminate value

Hint:

As pressure approaches zero, the fugacity to pressure ratio (f/P) for an ideal gas approaches unity.

Answer 1

The Correct Option is B

Step 1: Understanding the fugacity concept.
For ideal gases, the fugacity approaches the pressure as pressure approaches zero. The ratio of fugacity to pressure tends to 1, which is unity.

Step 2: Explanation of options.
- (B) Unity is the correct answer as the ratio of fugacity to pressure approaches 1 for an ideal gas as pressure approaches zero. - (A) Zero would not apply here, as the fugacity and pressure are proportional at low pressures. - (C) Infinity is not correct, as the ratio approaches 1, not infinity. - (D) The ratio does not have an indeterminate value at low pressures.

Final Answer: \[ \boxed{\text{B) unity}} \]