QuestionJune 2, 2025

When a sample of Mg(s) reacts completely with O_(2)(g) , the Mg(s)loses 5 moles of electrons . How many moles of electrons are gained by the O_(2)(g) ? 1. 1.0 mol 2. 2.5 mol 3. 5.0 mol 10.0 mol 4.

When a sample of Mg(s) reacts completely with O_(2)(g) , the Mg(s)loses 5 moles of electrons . How many moles of electrons are gained by the O_(2)(g) ? 1. 1.0 mol 2. 2.5 mol 3. 5.0 mol 10.0 mol 4.
When a sample of Mg(s) reacts completely with
O_(2)(g) , the Mg(s)loses 5 moles of electrons . How
many moles of electrons are gained by the O_(2)(g) ?
1. 1.0 mol
2. 2.5 mol
3. 5.0 mol
10.0 mol 4.

Solution
4.6(147 votes)

Answer

10.0 mol Explanation 1. Determine electron transfer in reaction Magnesium (Mg) loses electrons to form Mg^{2+}. Each Mg atom loses 2 electrons. Therefore, 5 moles of electrons lost by Mg corresponds to 2.5 moles of Mg atoms reacting. 2. Calculate electrons gained by O_2 Oxygen (O_2) gains electrons to form O^{2-}. Each O_2 molecule gains 4 electrons (2 per oxygen atom). Thus, 2.5 moles of O_2 molecules will gain 10 moles of electrons.

Explanation

1. Determine electron transfer in reaction<br /> Magnesium ($Mg$) loses electrons to form $Mg^{2+}$. Each $Mg$ atom loses 2 electrons. Therefore, 5 moles of electrons lost by $Mg$ corresponds to 2.5 moles of $Mg$ atoms reacting.<br />2. Calculate electrons gained by $O_2$<br /> Oxygen ($O_2$) gains electrons to form $O^{2-}$. Each $O_2$ molecule gains 4 electrons (2 per oxygen atom). Thus, 2.5 moles of $O_2$ molecules will gain 10 moles of electrons.
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