Relative Mass: Atomic, Molecular, and Formula (HSC SSCE Chemistry): Flashcards
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Value assigned to carbon-12 as reference standard
Value assigned to carbon-12 as reference standard
12
Rel. atomic mass compares atom mass to which standard?
Rel. atomic mass compares atom mass to which standard?
Carbon-12 (taken as exactly 12)
Why rel. atomic mass is a weighted average
Why rel. atomic mass is a weighted average
Elements have isotopes with different masses
Rel. atomic mass of chlorine (Cl-35: 75%, Cl-37: 25%)
Rel. atomic mass of chlorine (Cl-35: 75%, Cl-37: 25%)
35.5
Units of relative atomic mass
Units of relative atomic mass
None (pure number)
How to calculate relative molecular mass
How to calculate relative molecular mass
Sum all atomic masses in molecular formula
When to use relative molecular mass
When to use relative molecular mass
For covalent compounds (exist as molecules)
When to use relative formula mass
When to use relative formula mass
For ionic compounds (crystal lattices)
Structure ionic compounds form instead of molecules
Structure ionic compounds form instead of molecules
Crystal lattices
Rel. molecular mass of water ()
Rel. molecular mass of water ()
18.02