Amount of substance - Relative Masses Flashcards
What isotope is the international standard for comparing to?
C12
What is atomic mass measured in?
Unified atomic mass unit (u)
What is relative isotopic mass?
The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12
How do you figure out the relative isotope mass?
It’s the same as the mass number
What is relative atomic mass?
The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of carbon-12
What can relative atomic mass be shortened to?
Ar
How do you work out relative atomic mass?
((Isotopes % abundance x isotopes mass number)) + ((Isotopes % abundance x isotopes mass number))
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100
What is relative molecular mass shortened to?
Mr
How to you work out relative molecular mass?
Mass number x 2
It’s for the diatomic ones (O2, N2)
What is relative formula mass applied to?
Ionic compounds
How do you work out relative formula mass?
Take the relative atomic mass of each element and add together
