Trace Hoeger
Jan 13, 2025
What is the mass of 18.8 moles of helium (He) atoms?
What is the mass of 18.8 moles of helium (He) atoms?
a) 0.213 g
b) 4.70 g
c) 37.6 g
d) 75.2 g
Which of the following has the greatest mass in grams?
1) 1 atom of gold (Au)
2) 0.5 moles of lead (Pb) atoms
3) 2.0 moles of chlorine (Cl) atoms
4) 25 atoms of mercury (Hg)
3 Answers
mass = 18.8 g x 4.00 g/mol=75.2 g
0.5 mol Pb because mass Pb = 0.5 mol x 207.2 g/mol=103.6 g
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 gram
2.0 mole Cl ATOMS is 2 x 35.5 = 71 gram
The answer is 0.5 mole Pb
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