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.
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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.
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