Understanding the Concepts

* STP (Standard Temperature and Pressure): This refers to a specific set of conditions: 0°C (273.15 K) and 1 atm pressure.

* Molar Volume of a Gas at STP: At STP, one mole of any ideal gas occupies 22.4 L.

Calculation

1. Use the molar volume of a gas at STP: Since 1 mole of oxygen gas occupies 22.4 L at STP, we can set up a proportion:

1 mole / 22.4 L = x moles / 180 L

2. Solve for x (the number of moles):

x = (1 mole * 180 L) / 22.4 L

x ≈ 8.04 moles

Answer: There are approximately 8.04 moles of oxygen gas in 180 L at STP.