Molality of a solution API

Computes molality (mol solute per kg solvent) from moles or grams+formula and solvent mass, the temperature-independent concentration used in colligative-property work. Answers 'What is the molality of 2 mol in 500 g solvent?', 'mol/kg of a salt solution?'.

Price$0.04per request

MethodPOST

Route/v1/chemistry/molality

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

chemistrymolalityconcentrationsolutioncolligativemol-per-kgsolventanalytical

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

Integration docs

Example request

{
  "moles": 2,
  "solventKg": 0.5
}

Example response

{
  "molality": 4,
  "units": "mol/kg",
  "moles": 2,
  "solventKg": 0.5,
  "formula": "b = moles / kg solvent"
}

Input schema

{
  "type": "object",
  "properties": {
    "moles": {
      "type": "number"
    },
    "grams": {
      "type": "number"
    },
    "formula": {
      "type": "string"
    },
    "molarMass": {
      "type": "number"
    },
    "solventKg": {
      "type": "number",
      "examples": [
        0.5
      ]
    },
    "solventG": {
      "type": "number"
    }
  }
}

Output schema

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