STP Calculator (Standard Temperature and Pressure)

Standard Temperature and Pressure Calculator

Volume:

Pressure:

Temperature:

Volume at Standard Conditions (STP)

Volume (L): Volume (mL): Volume (cm³): Volume (m³): Volume (gal): Volume (qt): Volume (pt): Volume (cup): Volume (fl oz):

Number of Moles at Standard Conditions (STP)

Number of Moles (mol):

1. What is an STP Calculator (Standard Temperature and Pressure)?

Definition: This calculator determines the volume and number of moles of a substance under standard temperature and pressure (STP) conditions based on its measured volume, pressure, and temperature.

Purpose: It is used in chemistry to standardize gas volumes and mole calculations for ideal gases at STP (0°C or 273.15 K, 1 atm or 760 Torr), aiding in stoichiometry, gas law applications, and experimental analysis.

2. How Does the Calculator Work?

The calculator uses the following formulas for STP (273.15 K, 760 Torr):

\[ V_{\text{STP}} = V \times \left(\frac{273.15}{T}\right) \times \left(\frac{P}{760}\right) \] \[ \text{Moles}_{\text{STP}} = \frac{V_{\text{STP}}}{22.4} \]

Where:

\( V_{\text{STP}} \): Volume at STP (in liters)
\( V \): Measured volume (converted to liters)
\( T \): Measured temperature (in Kelvin)
\( P \): Measured pressure (converted to Torr)
\( \text{Moles}_{\text{STP}} \): Number of moles at STP (using 22.4 L/mol for an ideal gas at STP)

Explanation: Enter the volume (e.g., 5 L), pressure (e.g., 850 Torr), and temperature (e.g., 350 K). The calculator converts units, computes \(V_{\text{STP}}\) in liters, and calculates the number of moles using 22.4 L/mol, outputting volume and moles in separate sections.

3. Importance of STP Calculations

Details: STP provides a standard reference for comparing gas volumes and moles, essential for gas law calculations, stoichiometry, and laboratory standardization, ensuring consistency across experiments and conditions.

4. Using the Calculator

Tips: Input the volume, pressure, and temperature with their respective units. Ensure all values are positive, and pressure is non-zero. The calculator assumes an ideal gas and uses STP conditions (273.15 K, 760 Torr). Results are approximate for real gases under non-ideal conditions.

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