One mole of Pb has the greatest mass and the mass is 207g
We know, that mass = given mole × Molecular weight
According to the given question, we need to find the masses of 1 mole of Na(Sodium), Pb(Lead), Be(Beryllium) and H₂
So,
Mass of Na = 1 × 23 = 23g
Mass of Pb = 1 × 207 = 207g
Mass of Be = 1 × 9 = 9g
Mass of H₂ = 1 × 2 = 2g
Therefore, one mole of Pb (lead) has the greatest mass among the given four elements that are Na, Be and H₂.
The Molar mass of a substance is the mass in grams of one mole of the compound. Pb( lead) is a soft, malleable, ductile and dense metallic element.
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