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4. Find the number of atoms in 1 mole of Al₂O₃.

How many moles are in 90 g of H₂O? (MW H₂O = 18 g/mol)

What is the mass of 2.5 moles of NaCl? (MW NaCl = 58.5 g/mol)

How many molecules are in 0.4 moles of CO₂?

How many moles are in 45 g of C₃H₈ (Propane)? (Molecular weight of C₃H₈ = 44 g/mol)

Avogadro number equals the mole when

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3.