Question

the diagram below shows the reaction of oxygen gas and hydrogen gas to form water
2h₂ + o₂ → 2h₂o
key
hydrogen atom
oxygen atom
the chemical reaction shown above takes place in a closed system. what is true about the system while the reaction occurs?
oa. the total mass of the system stays the same
ob. the total mass of the system increases
oc. the mass of the hydrogen atoms decreases
od. the mass of the oxygen atoms increases

Explanation:

According to the law of conservation of mass, in a closed system, the total mass of the reactants is equal to the total mass of the products. In this reaction, hydrogen and oxygen react to form water. The atoms are just rearranged, not created or destroyed. So the total mass of the system remains the same.

Answer:

A. The total mass of the system stays the same