Original post by Slugzie(:
It is from the AS Chemistry paper 1 AQA
9. Which sample, measured at room temperature and pressure, contains the greatest number of the stated particles?
A. 1g of hydrogen molecules
B. 1g of helium atoms
C. 1dm^3 of hydrogen molecules
D.1dm^3 of helium atoms
9. Which sample, measured at room temperature and pressure, contains the greatest number of the stated particles?
A. 1g of hydrogen molecules
B. 1g of helium atoms
C. 1dm^3 of hydrogen molecules
D.1dm^3 of helium atoms
Under the same conditions, 1 mole of any gas will occupy a fixed volume. At RTP, 1 mole of gas occupies 24 dm^3 (but I don’t believe you need to memorise this for AQA).
As such, C and D cannot be the right answers as they will contain the same number of gas particles, since they are equal volumes.
Try calculating the moles in A and B (remember hydrogen is H2 (g) and helium is He (g)) and see which result is bigger.
(edited 1 month ago)
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