Which of the following abides by the principle of mass conservation according to the balanced reaction? 4 K + O₂ → 2 K₂O

Question

Quizplus · Accepted Answer

The principle of mass conservation states that the total mass of reactants must equal the total mass of products in a chemical reaction. Looking at each option, we can calculate the total mass of reactants and products to see which option abides by this principle.

Option A: 39.0g + 16.0g = 55.0g (mass of reactants); 94.0g (mass of product) 
55g ≠ 94g, so Option A is not correct.

Option B: 156.0g + 24.0g = 180.0g (mass of reactants); 188.0g (mass of product) 
180g ≠ 188g, so Option B is not correct.

Option C: 156.0g + 32.0g = 188.0g (mass of reactants); 188.0g (mass of product) 
188g = 188g, so Option C is correct.

Option D: 78.0g + 32.0g = 110.0g (mass of reactants); 110.0g (mass of product) 
110g = 110g, so Option D is technically correct, but it is not the best choice because it represents only half the amount of reactants needed to produce the same amount of product as Option C.

Which of the Following Abides by the Principle of Mass