Question

standard temperature and pressure (stp) is defined as: a 760 torr and 100 °c b 100 kpa and 273 °c c 1 atm and 0 °c d 1 atm and 25 °c

Explanation:

To determine the correct definition of standard temperature and pressure (STP), we recall the scientific definition: STP is defined as 1 atmosphere (atm) of pressure and 0 °C (which is 273.15 K) of temperature.

• Option A: 100 °C is incorrect for STP temperature (should be 0 °C), so A is wrong.
• Option B: 273 °C is incorrect (273 °C is 546 K, while STP temperature is 273 K or 0 °C), so B is wrong.
• Option C: 1 atm (which is equivalent to 760 torr) and 0 °C matches the definition of STP, so C is correct.
• Option D: 25 °C is the temperature for standard state (not STP), so D is wrong.

Answer:

C. 1 atm and 0 °C