1. Write down the various postulates of Dalton’s atomic theory and explain the law of conservation of mass.

Dalton's Atomic Theory consists of several postulates:

1. All matter is made up of tiny indivisible particles called atoms.
2. Atoms of the same element are identical in mass and properties.
3. Atoms of different elements have different masses and properties.
4. Atoms combine in simple whole number ratios to form compounds.
5. Atoms cannot be created, divided into smaller particles, or destroyed in the chemical reaction.

The Law of Conservation of Mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

For example, if you have 2 grams of hydrogen that reacts with 16 grams of oxygen, you will end up with 18 grams of water. The mass of the reactants (hydrogen and oxygen) equals the mass of the products (water). This is a demonstration of the law of conservation of mass.