Why is it important to know the properties of gases at standard temperature and pressure (STP)?

• A. Because gases only exist at STP and not at other temperatures or pressures.
• B. Because STP is the only condition where gases behave as ideal gases.
• C. Because STP provides a reference point for comparing gas volumes and behaviors under consistent conditions.
• D. Because STP is required for all chemical reactions involving gases to occur.

Answer: (C)

Verified step by step guidance

1. Understand that Standard Temperature and Pressure (STP) is defined as a specific set of conditions: a temperature of 0°C (273.15 K) and a pressure of 1 atm (101.3 kPa).
2. Recognize that knowing gas properties at STP allows chemists to have a common reference point, which makes it easier to compare and predict the behavior of gases under different conditions.
3. Recall that gases do not only exist at STP; they exist at many temperatures and pressures, but their properties can vary widely depending on these conditions.
4. Note that gases do not always behave ideally, but STP conditions are often used as a standard baseline where ideal gas approximations are more reasonable.
5. Conclude that STP is important because it provides consistency in measurements and calculations involving gases, facilitating communication and comparison in scientific work.