When calculating the average mass of one molecule, do the following: Calculate the molar mass of the substance Divide it by Avogadro's Number By the way, the technique to calculate the average mass of one atom of an element is exactly the same as for calculating the average mass of one molecule of a compound.

Ruger lcr lasermax battery replacementApr 16, 2018 · The mass number of carbon-13 is 13. When a number is given following an element name, this is its isotope, which basically states the mass number. To find the number of neutrons in an atom of the isotope, simply subtract the number of protons (atomic number). So, carbon-13 has 7 neutrons, because carbon has atomic number 6.

May 23, 2018 · And so for #""^1H#, the mass number is simply 1; for #""^2H#, the mass number is simply 2; for #""^3H#, the mass number is simply 3. The isotopes contain #"0, 1, 2 NEUTRONS"# respectively. Most of the heavier atoms have a range of isotopes, and the quoted atomic mass on the Table is the weighted average of the isotopic masses..