Question

Which statement best describes how chemical equations demonstrate conservation of mass?

A.The number of reactants is the same as the number of products.
B. The compounds are the same on each side of the reaction
C.The number of atoms of each element is the same on each side of the equation.
D. The state of matter is the same on each side of the equation.

Answer 1

C.The number of atoms of each element is the same on each side of the equation.

Explanation:

To conserve the mass in a chemical reaction the number of atoms of each element is the same on each side of the equation. As example we take the reaction of magnesium oxide (MgO) and hydrochloric acid (HCl) which produces magnesium chloride (MgCl₂) and water (H₂O).

MgO + 2 HCl → MgCl₂ + H₂O

Entering the reaction:

1 Mg atoms

1 O atom

2 H atoms

2 Cl atoms

Leaving the reaction:

1 Mg atoms

1 O atom

2 H atoms

2 Cl atoms

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