Which of the following has the least percentage of oxygen by mass? 2 mol H 2 O 1 mol C O 2 0.5 mol N O 2 0.25 mol O 2
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stoichiometry measures quantitative relationships and is used to determine the amount of products/reactants that are produced/needed in a given reaction.
(b) The number of atoms in a molecule of an element is called its atomicity. Atomicity of Hydrogen is 2, phosphorus is 4 and sulphur is 8.
(c) N2 means 1 molecule of nitrogen and 2N means two atoms of nitrogen.
N2 can exist independently but 2N cannot exist independently.
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