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

Question

Responses

N2+H2→NH3

H2O+O2→H2O2

K+MgBR→KBR+Mg
K+MgBR→KBR+Mg

P+O2→P2O5

Answer 1

The Law of Conservation of Mass states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. This means that the number of atoms of each element must be the same on both sides of the equation.

Let's analyze each equation to see if they follow this law:

1. N2 + H2 → NH3
   Reactants: 2 N, 2 H → Products: 1 N, 3 H (not balanced)

2. H2O + O2 → H2O2
   Reactants: 2 H, 2 O → Products: 2 H, 2 O (balanced)

3. K + MgBr → KBr + Mg
   Reactants: 1 K, 1 Mg, 1 Br → Products: 1 K, 1 Br, 1 Mg (balanced)

4. P + O2 → P2O5
   Reactants: 1 P, 2 O → Products: 2 P, 5 O (not balanced)

Among these, the equations H2O + O2 → H2O2 and K + MgBr → KBr + Mg correctly follow the Law of Conservation of Mass, as they are balanced.

However, if the question is asking for which one shows the principle clearly in terms of balancing, the correct response would be any one of the two equations that are balanced. If you need to pick only one, you can choose:

H2O + O2 → H2O2 (if looking for a more complex reaction).