Standard temperature and pressure are defined as
Correct answer: B. 0 degrees Celsius and 1 atm
- A. 25 degrees Celsius and 1 atm
- B. 0 degrees Celsius and 1 atm
- C. 0 K and 1 atm
- D. 100 degrees Celsius and 1 atm
Explanation
STP is 273.15 K, that is 0 degrees Celsius, at one atmosphere, and it is under these conditions that a mole of gas occupies 22.4 dm3. Room temperature and pressure, at 25 degrees, is a different reference where the molar volume is about 24 dm3. Quoting the wrong reference changes every subsequent calculation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Standard Temperature and Pressure
Standard temperature and pressure provide reference conditions for gas calculations: 0°C or 273 K and, in the usual school convention, 1 atm pressure. Questions use these conditions to relate pressure, volume, temperature and amount of gas, including the molar volume of an ideal gas, about 22.4 dm³.
Practise Gases
443 free Gases MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.