Chemistry

Question Analysis
This question involves the combined gas law and ratio-based simplification.
The main focus is on relating initial non-STP conditions to final STP conditions without solving for individual variables.

Key Concept Explanation
Combined gas law (constant ):
Rearranged for final volume ( ) at STP:
Ratio reasoning: A decrease in pressure (from 4.0 atm to 1.0 atm) will increase volume (inverse proportionality).
A decrease in temperature (from 300 K to 273 K) will decrease volume (direct proportionality). The final volume is the product of the initial volume and these two ratios.

Step-by-Step Solution
1. Define initial ( ) and final ( , STP) conditions:
, ,