Which of the following chemical equations shows the Law of Conservation of Mass?(1 point)

Question

Responses

N2+H2→NH3

P+O2→P2O5

H2O+O2→H2O2

K+MgBR→KBR+Mg

Answer 1

The Law of Conservation of Mass states that in a chemical reaction, matter is neither created nor destroyed. Thus, the number of atoms of each element must be the same on both sides of the equation.

Let's analyze the provided equations:

1. N2 + H2 → NH3

   • Reactants: 2 N and 2 H
   • Product: 1 N (from NH3) and 3 H
   • Not balanced.

2. P + O2 → P2O5

   • Reactants: 1 P and 2 O
   • Products: 2 P and 5 O
   • Not balanced.

3. H2O + O2 → H2O2

   • Reactants: 2 H and 3 O
   • Products: 2 H and 2 O
   • Not balanced.

4. K + MgBr → KBr + Mg

   • Reactants: 1 K, 1 Mg, and 1 Br
   • Products: 1 K, 1 Br, and 1 Mg
   • Balanced.

Out of the options, the equation that shows the Law of Conservation of Mass (with balanced atoms on both sides) is:

K + MgBr → KBr + Mg.