1. Calculate the moles of CO₂:
* Molar mass of CO₂: 12.01 g/mol (C) + 2 * 16.00 g/mol (O) = 44.01 g/mol
* Moles of CO₂: (25.0 g CO₂) / (44.01 g/mol CO₂) = 0.568 mol CO₂
2. Calculate the number of oxygen atoms:
* Mole ratio: There are 2 moles of oxygen atoms for every 1 mole of CO₂.
* Moles of oxygen: (0.568 mol CO₂) * (2 mol O / 1 mol CO₂) = 1.136 mol O
* Avogadro's number: 6.022 x 10²³ atoms/mol
* Number of oxygen atoms: (1.136 mol O) * (6.022 x 10²³ atoms/mol) = 6.84 x 10²³ oxygen atoms
Therefore, there are approximately 6.84 x 10²³ oxygen atoms present in 25.0 g of carbon dioxide.
