Arrhenius Equation Calculator
Shows how a rate constant depends on temperature.
Rate constant k
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
k at the second temperature —
Rate at second temperature ÷ first — times
Fraction of collisions with enough energy —
Reading this —
The formula
k = A × e^(−Ea ÷ RT)
R is 8.314 J/(mol·K) and T is in kelvin. The exponential makes rates very sensitive to temperature.
What to watch out for
To work out Ea from measurements, use the activation energy calculator.
Frequently Asked Questions
How much faster is a reaction with Ea of 50 kJ/mol at 35 °C than 25 °C?
1.92 times. That is where the rule of thumb about doubling every 10 °C comes from.
What does A mean?
It reflects how often particles collide in the right orientation. It is the rate constant the reaction would have if there were no energy barrier.