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The most common unit for mass is expressed in grams (g) or kilogram (kg) (1 kg = 10 3 g). In chemical measurement, IUPAC prescribes that the mass of a gas (m) be expressed in terms of the number of moles (n). The number of moles can be obtained from the ..

Atomic Number (Z) is the number of protons in the nucleus of an atom. It is also equal to the number of electrons since the atom is electrically neutral. Mass Number (A) is the total number of neutrons and protons present in the nucleus o..

Einstein derived a formula given the relation between mass and energy as E = mc 2 . Here 'm' is the mass, 'c' is the velocity of light and 'E' is the energy. This equation has given equal states to mass and energy. It states that a mass m ..

The condition in which a particular material exists is described by physical quantities such as pressure, volume, temperature and amount of substance. For example, a tank of oxygen in a welding outfit has a pressure gauge and a label stating its volume. We could add a thermometer and plac..

Assumptions stated by Classius - All the molecules of a gas are identical with respect to their shape and mass. The molecules of different gases are different. The gas molecules behave as rigid, elastic and smooth spheres. The size of gas molecules is very less when compared to ..

Stated by John Dalton (1803) "When two elements combine with each other to form two or more than two compounds, the masses of one the element which combine with the fixed mass of the other, bears a simple whole number rati..

Question: State the laws of chemical combination. Answer: Laws of chemical combinations are: i) Law of Conservation of Mass: The law states that during any physical or chemical change, the total mass of the product remains equal to the total ..

Summary The law of conservation of mass states that the masses of the reactants and products remain unchanged. The law of constant proportions states that all pure specimens of a compound always contain the same elements combined together in the same ..

The emission of g - rays does not produce any change either in mass number or in the atomic number of the nucleus. Emission of g - rays is observed in virtually all nuclear reactions from the nuclei, which are left in excited state by an earlier emission of a..

Measurements - Everything that we use in our daily life is ultimately governed by principles of physics. All gadgets we use everyday at home, bicycles and cars, all different types of machinery and instruments, work on principles of physics. Hence to understand even the elementary working..