A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Oct/Nov 2013 · Q81 Mark
Use of the Data Booklet is relevant to this question. The approximate percentage composition of the atmosphere on four different planets is given in the table below. The density of a gas may be defined as the mass of 1 dm³ of the gas measured at s.t.p. Which mixture of gases has the greatest density? [Table showing major gases/% by number of molecules for Jupiter, Neptune, Saturn, Uranus]
AJupiter H2 89.8, He 10.2
BNeptune H2 80.0, He 19.0, CH4 1.0
CSaturn H2 96.3, He 3.25, CH4 0.45
DUranus H2 82.5, He 15.2, CH4 2.3
✓ Correct answer
D: Uranus H2 82.5, He 15.2, CH4 2.3
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