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: Fugacity Concept.
For ideal gases, fugacity approximates pressure at low pressures. The ratio of fugacity to pressure approaches 1.

Step 2: Option Analysis.
- (B) Unity is correct because the fugacity to pressure ratio approaches 1 for ideal gases at low pressures. - (A) Zero is incorrect as fugacity and pressure are proportional at low pressures. - (C) Infinity is incorrect; the ratio approaches 1. - (D) The ratio is determinate at low pressures.

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