Question

what is the pressure and temperature at stp, respectively?
○ 1 atm, 25°c
○ 1 atm, 20°c
○ 1 atm, 0°c
○ 0 atm, 0°c
○ 1 torr, 0°c

Explanation:

STP (Standard Temperature and Pressure) is defined as a pressure of 1 atmosphere (atm) and a temperature of 0°C (or 273.15 K). We analyze each option:

• The first option has 25°C, which is standard ambient temperature (often for standard state in chemistry, not STP).
• The second option has 20°C, not STP temperature.
• The third option has 1 atm and 0°C, matching STP definitions.
• The fourth option has 0 atm, which is a vacuum, not STP.
• The fifth option has 1 torr (a very low pressure), not STP pressure.

Answer:

C. 1 atm, 0°C (assuming the third option is labeled C; if original labels are different, adjust the identifier but the text is "1 atm, 0°C")