Question

how many number of atoms of oxygen in 15.8g of KMnO4​

Answer 1

Element Symbol Atomic Mass # of Atoms Mass Percent

Manganese Mn 54.938049 1 34.763%

Oxygen O 15.9994 4 40.496%

Potassium K 39.0983 1 24.740%

Answer 2

Molar mass of KMnO₄ = 158g

No. of moles of KMnO₄ = 15.8/158 = 0.1 moles

So, one mole of KMnO₄ has 1 x 4 x 6.022 x 10²³ atoms

0.1 moles will have = 4 x 6.022 x 10²³ x 0.1 = 2.4088 x 10²³ atoms

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