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KC Calculator from KP Online

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The KC Calculator is designed to convert the equilibrium constant expressed in terms of partial pressure (KP) to its equivalent in concentration (KC). This conversion is vital for calculations involving chemical equilibria in solutions where concentrations are used instead of gas pressures.

Formula of KC Calculator from KP

To calculate the equilibrium constant KC from KP, use the following formula:

KC from KP

Where:

  • KC is the equilibrium constant in terms of concentration (molarity).
  • KP is the equilibrium constant in terms of partial pressure.
  • R is the ideal gas constant (0.0821 L·atm·mol⁻¹·K⁻¹).
  • T is the temperature in Kelvin.
  • Δn is the change in the number of moles of gas (moles of gaseous products minus moles of gaseous reactants).
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Step-by-Step Guide to Calculate KC

Step 1: Determine KP

Obtain the equilibrium constant value in terms of partial pressure from experimental data or literature.

Step 2: Convert Temperature to Kelvin

If the temperature is provided in Celsius, convert it to Kelvin by adding 273.15.

Step 3: Calculate Δn

Determine the net change in moles of gas by considering the stoichiometry of the reaction.

Step 4: Use the Formula

Plug the values of KP, R, T, and Δn into the formula to compute KC.

Conversion Table and Tools

Here’s a basic table showing typical values for KC calculations under various conditions for the same reaction:

ConditionKP (atm−2−2)Temp (°C)Temp (K)Δ𝑛ΔnKC (M−2−2)
Standard Conditions12025298-250720
High Temperature150500773-2168300
Low Temperature100-20253-238440

This table provides quick reference values for estimating KC under different thermal conditions without detailed calculations.

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Example of KC Calculator from KP

Consider the chemical reaction where nitrogen gas (N2) reacts with hydrogen gas (H2) to form ammonia (NH3):

N2(g) + 3H2(g) -> 2NH3(g)

For this reaction at a temperature of 500 K, the equilibrium constant in terms of partial pressure (KP) is known to be 150 atm^-2. We need to convert this to the equilibrium constant in terms of concentration (KC).

Steps to Calculate KC:

  1. KP Value: 150 atm^-2
  2. Temperature (T): 500 K
  3. Change in Moles of Gas (Delta n):
    • Moles of reactants: 1 N2 + 3 H2 = 4 moles
    • Moles of products: 2 NH3 = 2 moles
    • Delta n = 2 – 4 = -2
  4. Calculation:
    • Formula used: KC = KP * (RT)^(-Delta n)
    • R (ideal gas constant) = 0.0821 L·atm·mol^-1·K^-1
    • Calculation of (RT)^(-Delta n): (0.0821 * 500)^-2
    • Substituting values and calculating KC:
    • KC = 150 * (0.0821 * 500)^2
    • KC = 150 * 20.525^2
    • KC = 150 * 421.450625
    • KC = 63217.59375 M^-2
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This example shows how to convert KP to KC for this reaction, considering the given temperature and change in moles.

Most Common FAQs

Q1: How do temperature changes affect KC?

A1: Changes in temperature affect the value of T in the formula, thus directly impacting KC.

Q2: Can KP and KC be equal under certain conditions?

A2: Yes, when Δn is zero, KP equals KC since the exponent term becomes 1.

Q3: Why is it important to calculate Δn accurately?

A3: Δn determines the exponent in the formula, influencing the magnitude and direction of the effect on KC.

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