Pls 25 point

which law states that, in chemical reactions, the total mass of reactants must equal the total mass of the products?

conservation of molecules

conservation of energy

conservation of mass

conservation of elements

Law of conservation of mass

Explanation:

The chemical equation is always balanced on the basis of this law . According to this universal law, the substances and species appearing on the left hand side of chemical equation as reactants must be present in the right hand side of the equation as products showing that no new substance (mass) is created and no old mass (substance) is destroyed. The substance or mass only changed its form during a chemical reaction.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3