Molar mass of a formula

Extraits de code

curl "https://api.oanor.com/molarmass-api/v1/molarmass" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/molarmass-api/v1/molarmass", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/molarmass-api/v1/molarmass");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/molarmass-api/v1/molarmass",
    headers={"x-oanor-key": "oanor_test_..."}
)

Exemple de réponse

Une réponse réelle de ce endpoint, capturée lors du dernier contrôle de santé.

{
    "data": {
        "note": "Molar mass = Σ(atomic weight × count), using IUPAC conventional atomic weights. Percent is the mass fraction of each element.",
        "inputs": {
            "formula": "CuSO4.5H2O"
        },
        "elements": [
            {
                "count": 1,
                "element": "Cu",
                "percent": 25.451283,
                "atomic_weight": 63.546,
                "mass_contribution": 63.546
            },
            {
                "count": 1,
                "element": "S",
                "percent": 12.84059,
                "atomic_weight": 32.06,
                "mass_contribution": 32.06
            },
            {
                "count": 9,
                "element": "O",
                "percent": 57.670911,
                "atomic_weight": 15.999,
                "mass_contribution": 143.991
            },
            {
                "count": 10,
                "element": "H",
                "percent": 4.037216,
                "atomic_weight": 1.008,
                "mass_contribution": 10.08
            }
        ],
        "atom_count": 21,
        "molar_mass_g_mol": 249.677
    },
    "meta": {
        "timestamp": "2026-06-04T18:38:04.898Z",
        "request_id": "19ee7c8a-4f3e-40b7-96eb-ba5776846a07"
    },
    "status": "ok",
    "message": "Molar mass",
    "success": true
}