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Question
Which of the following has the largest number of atoms?
Options
1g Au (s)
1g Na (s)
1g Li (s)
1g Cl2 (g)
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Solution
1g Li (s)
Explanation:
The molar mass of:
- Au (Gold) is 197 g/mol
- Na (Sodium) is 23 g/mol
- Li (Lithium) is 7 g/mol
- Cl₂ (Chlorine molecule) is 71 g/mol
Since the number of moles = `(1g)/("Molar mass")`
Lithium (Li), with the smallest molar mass, will have the most moles and, therefore, the largest number of atoms.
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