![]() Please let us know how we can improve this web app. Related: Molecular weights of amino acids Weights of atoms and isotopes are from NIST article. Molar mass ( molar weight) is the mass of one mole of a substance and is expressed in g/mol.(1 u is equal to 1/12 the mass of one atom of carbon-12) Molecular mass ( molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u).To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.Įxamples of molecular weight computations:ĭefinitions of molecular mass, molecular weight, molar mass and molar weight Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.Ĭomputing molecular weight (molecular mass) Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg.Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al. &=\ (0.999885\times 1.007825) + (0.000115\times 2.014102) + (0\times 3.Computing molar mass (molar weight)To calculate molar mass of a chemical compound enter its formula and click 'Compute'. Here's how you calculate the molar mass of H₂O by hand: So we multiply 2 by 1.008, then we multiply 1 by 15.999, and finally add up the two resulting numbers. ![]() 1 molecule of H₂O has 2 atoms of hydrogen and 1 atom of oxygen. Oxygen has an average atomic mass of 15.999. Hydrogen has an average atomic mass of 1.008. You can find the average atomic mass for any element on the periodic table of elements. ![]() In order to calculate molar mass by hand, you need to look up average atomic mass for each element in your compound. Therefore, 1 molecule of H₂O weighs 18.02 g/mol (g/mol is the unit used for molar mass). So 1 atom of hydrogen weighs 1.008 amu (a unit used to measure weight of atoms). This is the sum of all masses (2.016 + 15.999) in this case, which equals 18.02. The bottom of the table says (Molar Mass). There is only 1 atom of oxygen in one 1 molecule of water, so we multiply 1 by 15.999, which equals 15.999. There are 2 atoms of hydrogen in 1 molecule of water, so we multiply 2 by 1.008, which equals 2.016. This is found by multiplying column two (Average Atomic Mass) by column three (Atoms). Since H₂O has 2 atoms of hydrogen and 1 atom of oxygen, it says 2 for H and 1 for O. The third column is (Atoms), which shows the number of each atom found in the given molecule. The average atomic mass of hydrogen is 1.008, and the average atomic mass of oxygen is 15.999. The average atomic mass is found on the periodic table of elements as the bottom number. The average atomic mass is a weighted average of all of the isotopes of a given element. The second column says (Average Atomic Mass). This compound is also known as Water or Dihydrogen Monoxide. In this case, it says H and O because H and O are the two elements found in the molecule H₂O, or water. The first column (Element) shows the symbols of the elements in the chemical given. Below this, you'll see a table which breaks the calculation down step-by-step. The molar mass shows up in the green box. Say you need to calculate the molar mass of H₂O.
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