Answer:
A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
Explanation:
Burning occurs in the presence of oxygen. A chemical combination occurs between Mg and O in that the atom of magnesium attracts one another.
Mg + O₂ → MgO
Starting with the magnesium, on reacting with oxygen a new compound forms. This is why there is mass increase in the MgO compared to the starting material.
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Explanation is in the file
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The proton slightly beats out the neutron in mass, the electron weighs a lot less, the quark weighs an infinitesimal amount, and the neutrino has no mass
