Question

Which of the following correctly illustrates the conservation of mass for the reaction below? I choose B but I’m not sure if I’m correct!

Answer 1

$4Na_{(s)}+O_{2(g)}\rightarrow2Na_2O_{(s)}$

Answer: A

$Na(23\times4=92g);O2(16\times2=32g);Na2O(23+23+16)\times2=124$

Explanation: Based on the Law of conservation of mass the total mass of the reactants will equal to the total mass of the products. This happens as matter is not destroyed.