The molar volume (in units of litres per mole) is the same for all gases at the same temperature and pressure - Scottish Highers Chemistry - Question 10 - 2018
Question 10
The molar volume (in units of litres per mole) is the same for all gases at the same temperature and pressure.
Using your knowledge of chemistry, suggest how the mo... show full transcript
Worked Solution & Example Answer:The molar volume (in units of litres per mole) is the same for all gases at the same temperature and pressure - Scottish Highers Chemistry - Question 10 - 2018
Step 1
Using hydrochloric acid and zinc
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Answer
To measure the molar volume of hydrogen gas, use a gas syringe. Add zinc to hydrochloric acid in a flask and collect the hydrogen gas produced in the gas syringe. The volume of gas collected can then be measured.
Step 2
Using calcium and hydrochloric acid
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Answer
Similarly, calcium can react with hydrochloric acid to produce hydrogen. The volume can be captured in a gas syringe in the same manner as described above.
Step 3
Comparing with other gases
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For gases like nitrogen and carbon dioxide, measure a known mass of the gas and use a gas syringe or suitable calibration apparatus to determine its volume at standard temperature and pressure (STP). Comparing the volumes will allow assessment of their molar volumes.
Step 4
Using a vacuum pump
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Answer
For gases such as carbon dioxide and nitrogen, a vacuum apparatus can be used to ensure the gas's volume is measured under controlled conditions, allowing for more accurate results.
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