Please let us know how we can improve this web app. The stable isotope of helium with relative atomic mass 4.002603. 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.
The electron configuration of helium is 1s 2. Helium is an element that has the atomic number 2 and is a gaseous substance. (1 u is equal to 1/12 the mass of one atom of carbon-12) Key Terms: Atomic Mass, Atomic Number, Deuterium, Helium, Hydrogen, Isotopes of Helium, Protium, Tritium. 'To see how much mass is consumed, we compare the combined mass of four hydrogen atoms (the ingredients) to the mass of one helium atom (the product) 4 hydrogen atoms 6.692 x 10-27kg - 1 Helium atom 6.645 x 10-27kg. Molecular mass ( molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). In the case of He-4, this is about 28.3 MeV, which has a mass equivalent of 0.0304 atomic mass units.(carbon twelve) is defined as 12 amu so, this is an exact number. 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 Atomic mass is based on a relative scale and the mass of 12C. 24 He inclides the mass defect, we must subtract 4.0026 u from the sum of the individual masses of the nucleons, including the mass to the electrons. The atomic mass or relative isotopic mass refers to the mass of a single particle. 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) To determine the binding energy, we calcualte the mass defect in atomic mass units and then use the fact that one atomic mass unit is equivalent to 931.5 MeV of energy. It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic. Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg.The atomic masses of these atoms are 4.00 u, 55.9 u, and 207 u, respectively. 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. Calculate the mass of an atom of (a) helium, (b) iron, and (c) lead. Computing molar mass (molar weight)To calculate molar mass of a chemical compound enter its formula and click 'Compute'. Definition and molecular weight (molar mass) of some common substances.