The same moles of H2, N2, and O2 are present in 0.1 cc volume at STP. Which one has the greatest number of molecules:
Correct answer: D. Number of molecules are equal
- A. N2
- B. H2
- C. O2
- D. Number of molecules are equal
Explanation
The number of molecules is given by the formula:Number of molceules = moles x avogadros constantSince all of the given elements have the same number of moles all of them will have the same number of molecules, which will be 6.02 x 1023, the Avogadros constant.
This question appeared on the UHS MDCAT 2023 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
More Standard Temperature and Pressure questions
28g of N¬2 at STP will occupy a volume of:
One mole of any gas at standard temperature and pressure (STP) occupies a volume of:
Which unit of pressure is commonly used by meteorologist?
Calculate the volume occupied by 2.8 g of nitrogen gas at STP is:
The volume occupied by 3.2 g of oxygen at STP is:
The volume occupied by 1.6 g of O2 at S.T.P is: