Question

The reaction below appears
to get heavier, explain why
Magnesium + Oxygen > Magnesium Oxide

Answer 1

Reaction appears to get heavier as molar mass of Magnesium oxide is more than the molar mass of reactants.

Molar mass: It is defined as the sum of atomic mass of each atom in a molecule or compound. If its only an element, then molar mass is same as the atomic mass of that element.

Calculate the molar mass of Magnesium oxide.

• The formula of Magnesium oxide is $MgO$.
• The atomic mass of magnesium ($Mg$) =24.305 g/mol
• The atomic mass of Oxygen ($O$) = 16.000 g/mol
• Thus, the molar mass of $MgO$ is calculated as-

$Molar\ mass\ of\ MgO = Atomic\ mass\ of\ Mg\ +Atomic\ mass\ of\ O\= = 24.305\ g/mol + 16.000\ g/mol\\ Molar\ mass\ of\ MgO = 40.305\ g/mol$

• Now, the formation of Magnesium oxide can be shown as-

$2Mg + O_{2}$→$2MgO$

• As the product ($MgO$) has higher molar mass, that means the product formed would be heavier than reactants.

To learn more about the molar mass, visit:

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