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). 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. The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol.Say you need to calculate the molar mass of H₂O.CO 2 has one carbon atom and two oxygen atoms.Oxygen (O) has an atomic mass of about 16.00 amu.Carbon (C) has an atomic mass of about 12.01 amu.Let's calculate the molar mass of carbon dioxide (CO 2): Add them together: add the results from step 3 to get the total molar mass of the compound.Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.The atomic mass is usually found on the periodic table and is given in atomic mass units (amu). Find atomic masses: look up the atomic masses of each element present in the compound.For example, water is H 2O, meaning it contains two hydrogen atoms and one oxygen atom. Identify the compound: write down the chemical formula of the compound.One mole contains exactly 6.022 ×10 23 particles (Avogadro's number) Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules.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: 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, Tos, Bz, TMS, tBu, Bzl, Bn, DmgĮxamples of molar mass computations: NaCl, Ca(OH)2, K4, CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.

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. Trehalose appears as a white, crystalline solid with a sweet taste.Ĭomputing molar mass (molar weight)To calculate molar mass of a chemical compound enter its formula and click 'Compute'.

Periodic table molar mass calculator