one mole of MgSO4 contains 4 moles of oxygen atom it means
1 mole of MgSO4 = 4 * 6.022 * 1023 oxygen atoms
4.5 mole of MgSO5 = 4.5 * 4* 6.022 * 1023 which is equals to = 1.08 * 1025 atoms
hence option B is correct
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