Which of the following correctly represents the standard temperature and pressure (STP) values at sea level?

• A. 0^ext{o}C and 1 ext{ atm}
• B. 25^ext{o}C and 1 ext{ atm}
• C. 0^ext{o}C and 760 ext{ mmHg}
• D. 273 ext{ K} and 2 ext{ atm}

Answer: (A)

Verified step by step guidance

1. Understand that STP (Standard Temperature and Pressure) is a set of conditions commonly used as a reference in chemistry to describe gases.
2. Recall the standard temperature at STP is defined as 0 degrees Celsius, which can also be expressed as 273 Kelvin. This is the freezing point of water.
3. Recall the standard pressure at STP is defined as 1 atmosphere (atm), which is equivalent to 760 millimeters of mercury (mmHg) at sea level.
4. Compare the given options to these standard values: temperature = 0^\text{o}C (or 273 K) and pressure = 1 \text{ atm} (or 760 \text{ mmHg}).
5. Identify the option that matches both 0^\text{o}C and 1 \text{ atm} as the correct representation of STP.