It is the mass of one mole of an element in grams, which is its molar mass. Gram atomic mass is the mass of one mole of an element. It is determined by taking the atomic weight for an element on the periodic table and expressing it in grams. So, for example, sodium (Na) has an atomic weight of 22.99 u, so it has a gram atomic mass of 22.99 grams.
Atomic mass (atomic weight) is the average number of protons and neutrons in a sample of an element. It is a number calculated based on the natural abundance of isotopes of an element, so it doesn’t have to be a whole number. For example, the atomic mass of helium is 4.003 rather than 4. Atomic Mass and Mass Number
The actual atomic weight of carbon-13 is 13.003355, and is more precise because it was determined experimentally. Atomic mass is very close to the isotope number of an element. For basic calculation purposes, isotope number is equal to atomic mass.
Well, if you want the molar mass, you add together the mass of every individual element in the compound. Compounds don't have an atomic mass. For example in H_2O Hydrogen (H) has a mass of 1.008 Oxygen (O) has a mass of 16.00 Since there is 2 hydrogen atoms in H_2O we add 1.008 twice or we can say 2(1.008)+16= 18.016 If you look up the mass of water it is 18.01528 g/mol.
Mass number is the number of protons and neutrons to a specific atom or specific isotope of an element, and it tells us about the mass of the atom in amu, or atomic mass units. Atomic weight is the average mass of all the isotopes of an element. It is a weighted average, as shown in this video, that takes into account the abundances of all of
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