![]() One Da is equal to 1/12 the mass of one atom of carbon-12. ![]() Molecular mass (molecular weight) is expressed in the unified atomic mass units ( u) or daltons ( Da). Mass deficiency due to chemical bonding is not considered. The calculation is based on the isotopic composition of the elements. It is calculated in practice by summing the atomic weights of the atoms making up the substance’s molecular formula. Molecular weight, also called molecular mass, is the mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12. H₂O) are supported and automatically converted to normal form. H 2O) as well as denoted using the ‘tiny’ numbers, like ₂ or ₅, (e.g. ![]() Indices denoted using and html tags (e.g. You can enter a formula manually or paste the formula copied from a web page or text document (including DOC or PDF file). The degree of nesting is unlimited but all the brackets should be balanced. Parentheses ( ), square brackets and braces (curly brackets) can be used in the formulas. ![]() Indices should be entered as normal numbers after the appropriate elements or groups, e.g. The chemical formula should be entered using the upper case for the first character in the element’s name and the lower case for the second character (compare: Co – cobalt and CO – carbon monoxide). This Molecular Weight Calculator finds the average molecular weight, the elemental composition, and the mass distribution of a molecule given by its chemical formula. ![]()
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