What is the mass of 9 atom(s) of Oxygen in grams?

2 × 10⁻²² g

Explanation:

Step 1: Given data

Atoms of oxygen: 9 atoms

Step 2: Calculate the moles corresponding to 9 atoms of O

We will use Avogadro's number: there are 6.02 × 10²³ atoms of O in 1 mole of atoms of O.

9 atom × 1 mol/6.02 × 10²³ atom = 1 × 10⁻²³ mol

Step 3: Calculate the mass corresponding to 1 × 10⁻²³ moles of O

The molar mass of O is 16.00 g/mol.

1 × 10⁻²³ mol × 16.00 g/mol = 2 × 10⁻²² g

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