Source: https://guthlabs.ai/docs/instruments/bond-enthalpy-reaction-estimator/implementation/

instrument implementation / implementation-contract

# Bond Enthalpy Reaction Estimator implementation

A source-bound implementation contract for Bond Enthalpy Reaction Estimator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**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-clean

**Evidence ID**: t6-096

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme finite-looking count produces Infinity for both bond-energy sums and then Infinity − Infinity = NaN; without finite and physical-input validation, the estimator returns an undefined result. The specification also has no actual formula branch, despite requiring branch-switch testing.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

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

````
{
  "inputs": {
    "reaction": "H2(g) + Cl2(g) -> 2 HCl(g)",
    "bonds_broken": [
      {
        "bond": "H-H",
        "count": 1,
        "energy_kJ_per_mol": 436
      },
      {
        "bond": "Cl-Cl",
        "count": 1,
        "energy_kJ_per_mol": 243
      }
    ],
    "bonds_formed": [
      {
        "bond": "H-Cl",
        "count": 2,
        "energy_kJ_per_mol": 431
      }
    ]
  },
  "expected_outputs": {
    "estimated_delta_H_kJ_per_mol_reaction": -183
  },
  "working": "Broken-bond sum = (1 × 436) + (1 × 243) = 436 + 243 = 679 kJ/mol. Formed-bond sum = 2 × 431 = 862 kJ/mol. ΔH ≈ 679 − 862 = −183 kJ/mol reaction."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bond-enthalpy-reaction-estimator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/bond-enthalpy-reaction-estimator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/bond-enthalpy-reaction-estimator/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-tranche6/tranche6-results.json`