Question

which combination of temperature and pressure correctly describes standard temperature and pressure, STP? A) 0 degrees C and 101 kPa B) 1 degrees C and 0 kPa C) o degrees C and 22.4 kPa D) 100 degrees C and 100 kPa

Answer 1

Combination of temperature and pressure correctly describes STP: A) 0 degrees C and 101 kPa

Further explanation

Standard conditions for temperature and pressure are used as a reference in certain calculations or conditions

There are several standards used by various organizations such as IUPAC or NIST

There are 2 conditions that are usually used as a reference in chemical calculations (mainly for determining the volume per mole of a gas or the molar volume), namely:

•   1. Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

• 2 Room Condition

Conditions at T 25 ° C and P 1 atm are stated by RTP (Room Temperature and Pressure). Vm in this condition = 24.4 liters / mol

So 1 atm if converted to Pascal:

1 atm = 101,325 kPa

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Answer 2

Answer: A

0 degrees and 101 kPa are the conditions that describe the standard temperature and pressure. When expressed in K, the standard temperature 0 degrees equals 273.5 K. Also the standard pressure 101 kPa equals 760 mmHg or 1 Atm.