Question

define Mole and Molar mass

Answer 1

Mole is the SI unit for amount of substance. It is used for the measurement of very small, microscopic particles such as atoms and molecules. Broadly speaking, it is used to measure the number of particles whether atoms or molecules present in a given amount of substance. One mole is the amount of substance that contains as many particles as there are atoms present in exactly 12g of 12C isotope of Carbon. It has been found that there are 6.023 X 1023atoms present in 12 g of 12C isotope of Carbon.

One mole of any substance will always contain 6.023 X 1023 particles, no matter what the substance is. Therefore 1 mole of Na atoms contains 6.023 X 1023 atoms of Na, 1 mole of Hydrogen atom contains 6.023 X 1023atoms of Hydrogen atom, 1 mole of Hydrogen molecule will contain 6.023 X 1023 molecules of Hydrogen molecule (H2), 1 mole of CO2 will contain 6.023 X 1023 molecules of CO2.One mole of any substance is always equal to its molar mass in grams. We know that the molar mass of a substance in grams is always equal to the atomic mass (for atoms) or molecular mass (for molecules).Therefore 1 mole of Na atoms = molar mass of Na atoms = 23 g.1 mole of H2O molecules = molar mass of H2O molecules = 18.02 g

The following interconversion between number of moles, molar mass and number of particles will help



Molar mass of a substance is measured in grams. It is numerically equal to the atomic mass or the molecular mass of the substance in u and will be equivalent to one mole of the substance. For example Molar mass of Oxygen atom is 16g, molar mass of oxygen molecule (O2) is 32g.

Answer 2

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