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What is the mass of 18.8 moles of helium (He) atoms?

0.213 g 4.70 g 37.6 g 75.2 gWhich of the following has the greatest mass, in grams? 1 atom of gold (Au) 0.5 mol lead (Pb) atoms 2.0 mole of chlorine (Cl) atoms 25 atoms of mercury (Hg)
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3 Answers

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Sarai Dooley Jr.

Feb 20, 2025

mass = 18.8 g x 4.00 g/mol=75.2 g0.5 mol Pb because mass Pb = 0.5 mol x 207.2 g/mol=103.6 g... Show More
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Sarai Dooley Jr.

Feb 20, 2025

First: 18.8 mole He is 18.8 x 4 = 75.2 gram For the second question just FORGET about the two distractors that mention atoms. So we have the choice between 0.5 mole Pb which is 0.5 x 207 = 103.5 gram2.0 mole Cl ATOMS is 2 x 35.5 = 71 gramThe answer is 0.5 mole Pb... Show More
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Sarai Dooley Jr.

Feb 20, 2025

A mole is equal to a LOT of atoms (Avogadro’s number); your second question is down to two possibilities. You can find the grams/mole of each element on a periodic table (atomic mass).... Show More
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