Molar amount

Mass is what a vial is labelled in and the wrong unit for comparing two different compounds. A molar amount is the one that compares. The molar mass has to come from you.

Educational arithmetic only. Not medical advice and not a dosing protocol.

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What the bench will not tell you

This is educational arithmetic on figures entered by the reader. It is not medical advice, not a dosing protocol, and not a recommendation that anything be prepared, obtained or administered.

Nothing here states what quantity is appropriate for anyone, and there is no function in it that produces an amount to administer. A question about anyone’s health belongs with a licensed clinician who can examine the person asking.

Compounds of the kind this arithmetic is used on are largely research chemicals that are not approved by the FDA for human use. An exact calculation is not an accurate measurement: what is actually in a syringe depends on the preparation and the device, neither of which this page can see.

No qualified clinical reviewer is recorded against this site, and no credential is claimed anywhere on it. the limits of this bench.

The arithmetic, step by step

n = m / M, where M is the molar mass in grams per mole. The units work out because a gram per mole is also a microgram per micromole.
Five milligrams of something at 1,419.5 g/mol is 5000 / 1419.5 = 3.52237 micromoles, which is 3,522.37 nanomoles.
One nanomole of that compound weighs 1419.5 / 1000 = 1.4195 micrograms, which is the figure to multiply by if you are going the other way.

Why a molar amount is worth the trouble

One milligram of a 889 g/mol compound contains about 5.4 times as many molecules as one milligram of a 4,813 g/mol compound. If two compounds are being compared in any way at all, the molar amount is the figure that compares and the mass is not.

The comparison stops at molecule counts, and that limit is absolute. Equal molar amounts are not equal potency, equal activity, equal binding or equal anything else. The arithmetic tells you how many molecules; it tells you nothing about what they do.

Why this bench does not know any molar masses

A molar mass is a fact about a molecule, so it is knowable, and it is published in public chemical records that can be read at source. It is still not a fact this bench holds, because holding it would mean maintaining a compound table and standing behind every row of it. A tool with an out-of-date table that nobody is checking is worse than a field.

So the figure is an input, and the honest answer to "which compound is this?" is that the bench does not know and does not need to. It divides the number you brought by the other number you brought.

Next to this on the bench

Mass and volume units
The conversions that need nothing from anybody.
International units
The other conversion with an input from outside.
How this is made
What this bench holds and what it refuses to.