ForHosting KIT · Developer Utilities

Vapor pressure molar mass calculator

This vapor pressure molar mass calculator returns the solute molar mass M in grams per mole from the relative vapor-pressure lowering χ equals (P° minus P) over P°, the amount of solvent in moles, and the mass of non-volatile solute in grams using Raoult’s law rearrangement M equals g times (1 minus χ) divided by χ times n1.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Relative lowering equals the mole fraction of solute for an ideal solution of a non-volatile solute, so the same identity that links measured vapor pressures to composition also yields the unknown molar mass without a molecular formula. The same path appears in general chemistry labs that compare manometer or isoteniscope readings of pure solvent and solution, in identification of unknowns from colligative vapor-pressure data, and in homework that gives χ and solvent moles instead of moles of solute. Typical textbook checks include χ equals 0.02 with five moles of solvent and ten grams of solute yielding about ninety-eight grams per mole, and a smaller lowering with the same masses yielding a larger M. The engine uses only finite arithmetic with no network calls, no sampling, and no date-dependent shortcuts. Use it free in the browser for homework and lab prep, or call the API at $0.002 per successful request when you need identical molar-mass fixtures in CI, tutoring software, or teaching demos.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/chem/vapor-pressure-molar-mass

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/chem/vapor-pressure-molar-mass \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"relative_lowering":0.02,"solvent_moles":5,"solute_grams":10}'

const res = await fetch("https://api.kit.forhosting.com/chem/vapor-pressure-molar-mass", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "relative_lowering": 0.02,
    "solvent_moles": 5,
    "solute_grams": 10
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/chem/vapor-pressure-molar-mass",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "relative_lowering": 0.02,
    "solvent_moles": 5,
    "solute_grams": 10
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/chem/vapor-pressure-molar-mass", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"relative_lowering":0.02,"solvent_moles":5,"solute_grams":10}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"relative_lowering":0.02,"solvent_moles":5,"solute_grams":10}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/chem/vapor-pressure-molar-mass", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "relative_lowering": 0.02,
  "solvent_moles": 5,
  "solute_grams": 10
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "chem.vapor_pressure_molar_mass",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Limits

max_abs_value 1000000000000000

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →

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