Arrhenius rate / Ea API

Evaluates the Arrhenius equation k = A·e^(-Ea/RT) for a rate constant, or solves activation energy Ea from two (k,T) points. Answers 'What is the rate constant at 350 K?', 'Find Ea from rate constants at two temperatures'.

Price$0.06per request

MethodPOST

Route/v1/chemistry/arrhenius

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

chemistryarrheniusactivation-energyrate-constantkineticstemperaturereaction-ratethermodynamics

API URLhttps://x402.hexl.dev/v1/chemistry/arrhenius

Integration docs

Example request

{
  "k1": 1,
  "t1": 300,
  "k2": 2,
  "t2": 310
}

Example response

{
  "activationEnergy": 53597.2608,
  "activationEnergyKJ": 53.597261,
  "gasConstant": 8.314462618,
  "gasConstantUnits": "J·mol⁻¹·K⁻¹",
  "formula": "ln(k2/k1) = -Ea/R · (1/T2 - 1/T1)"
}

Input schema

{
  "type": "object",
  "properties": {
    "preExponential": {
      "type": "number"
    },
    "activationEnergy": {
      "type": "number"
    },
    "temperatureK": {
      "type": "number"
    },
    "k1": {
      "type": "number",
      "examples": [
        1
      ]
    },
    "t1": {
      "type": "number",
      "examples": [
        300
      ]
    },
    "k2": {
      "type": "number",
      "examples": [
        2
      ]
    },
    "t2": {
      "type": "number",
      "examples": [
        310
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}