At standard temperature and pressure (STP), how many moles of neon gas occupy a volume of 14.3 L?

• A. 2.14 mol
• B. 1.00 mol
• C. 0.638 mol
• D. 0.320 mol

Answer: (C)

Verified step by step guidance

1. Recall that at standard temperature and pressure (STP), one mole of any ideal gas occupies a volume of 22.4 liters. This is a key concept from the ideal gas law and molar volume of gases.
2. Write down the known values: volume of neon gas, \(V = 14.3\ \text{L}\), and molar volume at STP, \(V_m = 22.4\ \text{L/mol}\).
3. Set up the relationship between volume and moles using the molar volume: \(n = \frac{V}{V_m}\), where \(n\) is the number of moles.
4. Substitute the known values into the equation: \(n = \frac{14.3}{22.4}\).
5. Perform the division to find the number of moles of neon gas occupying 14.3 L at STP.