Scelta multipla
At standard temperature and pressure (STP), what volume will 35.9 g of hydrogen gas (H_2) occupy?
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7. Gases
Standard Temperature and Pressure
Scelta multipla
Which of the following best describes the standard conditions for gas measurements (Standard Temperature and Pressure, STP)?
A
0°C and 760 mmHg pressure
B
25°C and 1 atm pressure
C
273 K and 1 bar pressure
D
0°C and 1 atm pressure
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Understand that Standard Temperature and Pressure (STP) is a set of conditions commonly used as a reference point in gas calculations.
Recall that standard temperature is defined as 0°C, which is equivalent to 273 K (since K = °C + 273).
Recognize that standard pressure is often given as 1 atmosphere (atm), which is equivalent to 760 mmHg or 101.325 kPa.
Note that some sources use 1 bar (100 kPa) as standard pressure, but the most widely accepted STP conditions in chemistry are 0°C and 1 atm.
Therefore, the best description of STP is the combination of 0°C (273 K) temperature and 1 atm pressure.
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