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I'm not quite sure what kind of examples are useful...but I'll give it a shot.
Ar refers to the relative atomic mass, while Mr refers to relative molar mass.
If you look at the periodic table, the larger number (usually found at the bottom) of each element is the nucleon number/mass number and is also taken to be the relative atomic mass.
For example, sodium (Na) would have an Ar of 23.0. But to see if you understand this, try posting the Ar values of aluminium (Al) and iron (Fe).
Moving on to Mr..for example, sodium chloride (NaCl) is composed of 2 elements, Na and Cl. The Mr will be equal to the addition of the Ar of Na and Cl. In other words, for any particular compound, the Mr of the compound is equal to the sum of all the Ar of the elements involved.
Example: MgCl2
Ar of Mg = 24.3
Ar of Cl = 35.5
Mr of MgCl2 = 24.3 + 35.5 + 35.5 (because there are two Cl)
= 95.3
Hope it helped.
Ar refers to the relative atomic mass, while Mr refers to relative molar mass.
If you look at the periodic table, the larger number (usually found at the bottom) of each element is the nucleon number/mass number and is also taken to be the relative atomic mass.
For example, sodium (Na) would have an Ar of 23.0. But to see if you understand this, try posting the Ar values of aluminium (Al) and iron (Fe).
Moving on to Mr..for example, sodium chloride (NaCl) is composed of 2 elements, Na and Cl. The Mr will be equal to the addition of the Ar of Na and Cl. In other words, for any particular compound, the Mr of the compound is equal to the sum of all the Ar of the elements involved.
Example: MgCl2
Ar of Mg = 24.3
Ar of Cl = 35.5
Mr of MgCl2 = 24.3 + 35.5 + 35.5 (because there are two Cl)
= 95.3
Hope it helped.
Its probably a bit late now but just for future reference..
working out molar mass =
mass / moles
working out ar values from a mass spectrum =
Ar = sum (isotopic mass x abundance)
------------------------------------
total abundance
working out molar mass =
mass / moles
working out ar values from a mass spectrum =
Ar = sum (isotopic mass x abundance)
------------------------------------
total abundance
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