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Because Atomic Mass is the sum of both atomic number and number of neutrons in an atom.

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12y ago
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16y ago

The atomic number, which represents only the number of protons in the atom, does not take into account the number, and therefore the mass, of the atom's neutrons. (Nor the electrons, for that matter, but they are not considered to have weight.) Therefore there is only a loose relationship between atomic number and atomic mass or molar mass. And to complicate things further, atoms of the same element can exist in forms called isotopes, which, although possessing the same number of protons, have different numbers of neutrons, and therefore different mass.

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Q: Why does the molar mass increase by more than one unit when the atomic number increase by one unit?
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Related questions

Is avogadro's number the same as molar mass?

no youre thinking of molar mass and atomic weight although you use avogadro's number to find molar mass


What is the atomic number and atomic mass of alcohol?

Alcohol does not have an atomic number because it is not an element. Its molar mass is 46.07 g mol−1.


What is molar atomic mass?

The atomic (molecular) weight of a substance is its molar mass.


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We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.


How is the molar mass of an element determined?

the Atomic Mass in g/ml is the molar mass of the element


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Molar mass is the weight of one mole of any chemical compounds. Atomic mass is the weight of just 1 atom of a compound


What is the relationship between the molar mass and atomic mass?

The molar mass is the mass of a molecule - sum of the masses of contained atoms, expressed in grams.The atomic mass is the mass of an isotope expressed in unified mass atomic units.The atomic weight is the mass of a chemical element (taking into account its isotopes) expressed in unified mass atomic units; also known today as relative atomic mass. IUPAC maintain the term (standard) atomic weight.


What are the steps for calculating molar mass of compound?

molar mass is the atomic mass of the element. it's on the Periodic Table. you just have to add them up. unless you want to calculate the number of moles in a compound, in that case: moles = mass/molar mass


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