28g of N¬2 at STP will occupy a volume of:
Correct answer: A. 22.41 dm3
- A. 22.41 dm3
- B. 44.82 dm3
- C. 64.82 dm3
- D. 2.241 dm3
Explanation
To find the volume of a gas, we use the formula: Moles = Volume of gas / 22. 41First, we find the moles of Nitrogen which are (mass / mr) so 28/28 = 1The volume of gas = Moles x 22.41Volume = 1 x 22.41 = 22.41 dm3
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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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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