Refer to question #5 . How many moles of oxygen gas (O2) are in 50.0 L of oxygen gas? 4.47 moles 2.23 moles 1.05 moles 0.915 moles

To determine the number of moles of oxygen gas (\(O_2\)) in 50.0 L, we can use the ideal gas law under standard temperature and pressure (STP) conditions. At STP, 1 mole of any ideal gas occupies 22.4 liters.<br /><br />Given:<br />- Volume of \(O_2\) = 50.0 L<br />- Molar volume at STP = 22.4 L/mol<br /><br />We can calculate the number of moles using the formula:<br /><br />\[<br />\text{Number of moles} = \frac{\text{Volume of gas}}{\text{Molar volume at STP}}<br />\]<br /><br />Substituting the given values:<br /><br />\[<br />\text{Number of moles} = \frac{50.0 \, \text{L}}{22.4 \, \text{L/mol}} \approx 2.23 \, \text{moles}<br />\]<br /><br />Therefore, the correct answer is 2.23 moles.