Calculate the number of molecules in 4g of oxygen.

To calculate the number of molecules in 4g of oxygen, we have,

Moles of oxygen = 4/32 = 0.125mol,

Molecules of oxygen = 0.125 * 6.022 * 1023 = 7.52 * 1022.

Oxygen’s atomic weight is 16.00 amu where 1 mole of oxygen is

6.02 x 1023 atoms of oxygen 1 amu = 1.661 x 10-24g.

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