Question

an equation for a chemical reaction is shown. naoh + hcl → nacl + h₂o. which statement provides evidence that mass is conserved in the reaction? two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products. one chlorine atom pairs with one sodium atom in the products, and one chlorine atom pairs with one hydrogen atom in the reactants. water is one of the products, but not one of the reactants. two new substances are formed in the products.

Explanation:

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants equals the total mass of the products, which is also reflected in the number of each type of atom being the same on both sides of the equation. The first option shows that the number of hydrogen atoms is conserved (same number in reactants and products), which is evidence of mass - conservation.

Answer:

Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.