A mole of lead will be heavier than a mole of oxygen because the molar mass of each element differs.
The mole and mass of elements are related, such that:
Mole = mass/molar mass.
Thus, mass = mole x molar mass.
Going by the above, 1 mole of lead (molar mass = 207) will have a different mass from 1 mole of oxygen (molar mass = 16).
More on mole and mass can be found here: https://brainly.com/question/21042927
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