Q how many moles of electrons are exchanged during the formation of 3 moles of MgO a)3 b)5 c)6 d)10

Monjur Alahi

Q how many moles of electrons are exchanged during the formation of 3 moles of MgO a)3 b)5 c)6 d)10

Pls explain the answer to me


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Salim Ahmed Kawsar

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Correct option is (C) 6 moles.

Explanation : During the for formation of MgO each Mg loses 2 electrons to form Mg2+ and oxygen gains those 2 electrons to form oxide ion O2- .  Hence in 1 mole of MgO, there is an exhange of 2 moles of electrons.

Therefore in 3 mole of MgO , there will an exchange of 3x2 = 6 moles of electrons.

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