Source: https://guthlabs.ai/docs/instruments/arrhenius-equation-calculator/implementation/

instrument implementation / implementation-contract

# Arrhenius Equation Calculator implementation

A source-bound implementation contract for Arrhenius Equation Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-with-binding-errata

**Evidence ID**: t4-298

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification permits arbitrary combinations without stating validation behavior. Equal temperatures with unequal rate constants produce an undefined activation energy, and an unspecified temperature unit produces materially different results. The calculator should reject singular inputs and require absolute temperature in kelvin.

## Required corrections

````
[
  {
    "vector": 4,
    "field": "k2, k2_over_k1",
    "wrong": "k2 200 (ratio 2) with Ea 1728.9439",
    "correct": "with given Ea: k2 = 141.42 (ratio √2); or Ea must be 3457.888 for ratio 2",
    "cause": "vector designed with T=300 in Ea instead of harmonic 600; her own working NOTICED the inconsistency and shipped anyway"
  }
]
````

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "A_s^-1": 250000000000,
    "Ea_J_per_mol": 0,
    "T_K": 298.15
  },
  "expected_outputs": {
    "k_s^-1": 250000000000
  },
  "working": "k = A·e^(-Ea/(RT))\n= 250000000000·e^(-0/(8.314462618·298.15))\n= 250000000000·e^0\n= 250000000000·1\n= 250000000000 s^-1"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/arrhenius-equation-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/arrhenius-equation-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/arrhenius-equation-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`

- `tranche errata record`