Van 't Hoff Equation Calculator
🔥 Thermochemistry & Bonding. Use the van 't Hoff equation formula to find k at t₂, k at t₁, δh°, temperature 1, temperature 2: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| K at T₂ | no unit |
| K at T₁ | no unit |
| ΔH° | kJ/mol |
| Temperature 1 | K |
| Temperature 2 | K |
Worked example
Find the k at t₂ when K at T₁ = 680000, ΔH° = -92.2 kJ/mol, Temperature 1 = 298 K, Temperature 2 = 500 K.
Using 2/K1 = (Δ H°)/R(1/T1 - 1/T2): K at T₂ = 0.20115.
Frequently asked questions
What is the formula for van 't Hoff equation?
2/K1 = (Δ H°)/R(1/T1 - 1/T2).
What do the letters stand for, and what units are used?
K at T₂, K at T₁, ΔH° in kJ/mol, Temperature 1 in K, Temperature 2 in K.
How do you calculate k at t₂?
Put the values into 2/K1 = (Δ H°)/R(1/T1 - 1/T2). For example, with K at T₁ = 680000, ΔH° = -92.2 kJ/mol, Temperature 1 = 298 K, Temperature 2 = 500 K, k at t₂ = 0.20115.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (k at t₂, k at t₁, δh°, temperature 1, temperature 2) and fill in the others: it rearranges the formula for you.
