Source: https://guthlabs.ai/docs/instruments/gas-stoichiometry-molar-volume-calculator/implementation/

instrument implementation / implementation-contract

# Gas Stoichiometry / Molar Volume Calculator implementation

A source-bound implementation contract for Gas Stoichiometry / Molar Volume Calculator; 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**: t4-147

**Effect**: Computation or source lookup only

## Input and validation requirements

A zero-pressure input produces an undefined division in the PV=nRT branch and requires rejection. A negative mass also exposes an unresolved sign convention: signed arithmetic gives -44.828 L, while a physical-amount interpretation gives +44.828 L or should reject the input.

## 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": "N2 + 3 H2 -> 2 NH3",
    "given_species": "H2",
    "given_amount": "3.000 mol",
    "target_species": "NH3",
    "conditions": "STP: 273.15 K, 1 atm"
  },
  "expected_outputs": {
    "target_moles_NH3": 2,
    "target_volume_L_NH3": 44.828,
    "target_mass_g_NH3": 34.062
  },
  "working": "1. Stoichiometric ratio: n(NH3)/n(H2)=2/3. 2. n(NH3)=3.000 mol H2 × (2 mol NH3/3 mol H2)=2.000 mol NH3. 3. V(NH3)=2.000 mol × 22.414 L/mol=44.828 L. 4. M(NH3)=14.007 + 3×1.008=17.031 g/mol. 5. m(NH3)=2.000 mol × 17.031 g/mol=34.062 g."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/gas-stoichiometry-molar-volume-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/gas-stoichiometry-molar-volume-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/gas-stoichiometry-molar-volume-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`