Question

1. How many oxygen atoms are in 225 g O2?

Answer 1

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$\huge\blue{Given:-}$


Mass of oxygen = 225g


Molar mass of Oxygen = O2=16×2=32g/mol


Atoms of oxygen = ?


$\huge\green{Solution:-}$


Mass/molar mass= number of atoms/ Avagadro number


Number of atoms = mass/molar mass ×Avagadro number


Number of atoms = 225/32×6.023×10^23


Number of atoms = 7 ×6.023×10^23


Number of atoms of oxygen = 49.2×10^23


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