Test molarmass in your browser at
https://tntran09.github.io/molarmass
https://tonicdev.com/npm/molarmass
npm install molarmass --save
molarmass(formula [, options]);
The chemical formula (case-sensitive)
| S | U | L | N | O | C | E | |
|---|---|---|---|---|---|---|---|
| S | x | x | |||||
| U | x | x | x | x | x | x | |
| L | x | x | x | x | x | x | |
| N | x | x | x | x | x | ||
| O | x | x | |||||
| C | x | x | x | x | x | ||
| E |
S: Beginning of the formula
U: Uppercase [A-Z]
L: Lowercase [a-z]
N: Number [0-9]
O: Open ( [
C: Close ) ]
E: end of the formula
Other allowed characters that are ignored: . - + = _ (space)
An 'x' in the table above at row R and column C means that a character of type R can be followed by a character of type C. For example, a number CAN be followed by an uppercase character, but NOT a lowercase character. A formula can ONLY begin with an uppercase character or open parentheses/bracket. A formula CANNOT end with an open parentheses/bracket
Defaults to { }
When set to true, returns an instance of the Compound class, which gives you access to the formula (string), molarMass (number), and elements (array) properties; when false, only the molar mass is returned as a number. Defaults to false.
The Compound's properties are read-only
var molarmass = require('molarmass');
console.log(molarmass('H')); // 1.00794
console.log(molarmass('OH')); // 17.00734
console.log(molarmass('H2')); // 2.01588
console.log(molarmass('(S8)')); // 256.52
console.log(molarmass('H2O')); // 18.01528
console.log(molarmass('C12H22O11')); // 342.29648
console.log(molarmass('H(CO)(CHOH)5H')); // 180.15588
console.log(molarmass('Na')); // 22.98977
console.log(molarmass('NaOH')); // 39.99711
console.log(molarmass('Cr2O7')); // 215.988
console.log(molarmass('Ca(OH)2')); // 74.09268
console.log(molarmass('Mg3(PO4)2')); // 262.857722
console.log(molarmass('((((Pt)7)5))')); // 6827.73
console.log(molarmass('(Fe2)O3')); // 159.6882
console.log(molarmass('(NH4)2Cr2O7')); // 252.06492
var c1 = molarmass('H2O', { returnCompound: true });
/*
c1: Compound { formula: 'H2O', molarMass: 18.01528, elements: [Getter] }
c1.elements: [
{
element: { name: 'Hydrogen', symbol: 'H', atomicNumber: 1, mass: 1.00794 },
quantity: 2
},
{
element: { name: 'Oxygen', symbol: 'O', atomicNumber: 8, mass: 15.9994 },
quantity: 1
}
]
*/ISC License © Toan Tran
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