I keep getting “Molar mass” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
using atomic number instead of atomic mass to find molar mass.
The usual trap: using atomic number instead of atomic mass to find molar mass. How to avoid it: moles = given mass ÷ molar mass. Go back to the definition — the mass of one mole of a substance in grams, numerically equal to its atomic/molecular mass.
Key point
Molar mass
Common mistake
using atomic number instead of atomic mass to find molar mass.
Memory tip
moles = given mass ÷ molar mass.
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