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STP Calculator

Chemistry
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Calculates the volume or number of moles of a gas at Standard Temperature and Pressure (STP). STP is defined as 0°C (273.15 K) and 1 atm pressure. This calculator uses the ideal gas law to perform these calculations.

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Pressure, Temperature, Volume, Number of Moles, and Gas Constant (R) in the units shown.

Step 2

Read Calculated Moles and Calculated Volume in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

STP Condition

Pressure: 1 atm; Temperature: 273.15 K; Volume: 22.4 L; Number of Moles: 1 mol; Gas Constant (R): 0.0821 L·atm/(mol·K)

Calculated Moles: 0.9988577794 mol; Calculated Volume: 22.425615 L

Double Moles at STP

Pressure: 1 atm; Temperature: 273.15 K; Volume: 44.8 L; Number of Moles: 2 mol; Gas Constant (R): 0.0821 L·atm/(mol·K)

Calculated Moles: 1.997715559 mol; Calculated Volume: 44.85123 L

Half Moles at STP

Pressure: 1 atm; Temperature: 273.15 K; Volume: 11.2 L; Number of Moles: 0.5 mol; Gas Constant (R): 0.0821 L·atm/(mol·K)

Calculated Moles: 0.4994288897 mol; Calculated Volume: 11.2128075 L

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