Understanding STP
STP stands for Standard Temperature and Pressure. It's defined as:
* Temperature: 0°C (273.15 K)
* Pressure: 1 atm (101.325 kPa)
Ideal Gas Law
The ideal gas law is a fundamental equation that relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas:
PV = nRT
Where:
* R is the ideal gas constant (0.0821 L·atm/mol·K)
Solving for Volume
1. Rearrange the ideal gas law to solve for volume (V):
V = (nRT) / P
2. Plug in the values:
V = (0.685 mol * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm
3. Calculate the volume:
V ≈ 15.4 L
Therefore, 0.685 mol of gas occupies approximately 15.4 liters at STP.
