1. What Is The Kp Formula?

The Kp formula calculates the equilibrium constant in terms of partial pressures for gas-phase reactions. It relates to Kc (the equilibrium constant in terms of concentrations) through the ideal gas law.

2. How Does The Calculator Work?

The calculator uses the Kp formula:

Where:

• \( Kc \) — Equilibrium constant in terms of concentration (unitless)
• \( R \) — Gas constant = 0.0821 L·atm·mol⁻¹·K⁻¹
• \( T \) — Temperature in Kelvin (K)
• \( \Delta n \) — Change in moles of gas (unitless)

Explanation: The formula converts between concentration-based and pressure-based equilibrium constants using the ideal gas law relationship.

3. Importance Of Kp Calculation

Details: Kp is essential for understanding gas-phase equilibria, predicting reaction directions, and calculating equilibrium partial pressures in chemical systems.

4. Using The Calculator

Tips: Enter Kc (must be positive), temperature in Kelvin, and Δn (change in moles of gas). All values must be valid numerical inputs.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between Kp and Kc?
A: Kp uses partial pressures while Kc uses concentrations. They're related through the formula Kp = Kc(RT)^Δn.

Q2: When should I use Kp instead of Kc?
A: Use Kp for gas-phase reactions when working with partial pressures, and Kc when working with concentrations.

Q3: What does Δn represent?
A: Δn is the difference between the sum of coefficients of gaseous products and gaseous reactants.

Q4: What are the units of Kp?
A: Kp is typically unitless, though it may have units when Δn ≠ 0 depending on the reaction.

Q5: Can Kp be negative?
A: No, equilibrium constants are always positive values representing the ratio of products to reactants.