Question

The symbol for SI unit if mole is:
A. mol
B. Mole
c. M
D. none

Answer 1

Hint: The Word SI is a French word. The abbreviation of SI means Systeme International. It is used universally to measure standard measurements. In the SI system the units of length, mass and time are metre (m), kilogram (kg) and second (s) respectively.

Complete answer:
- In the question it is asked to write the symbol for the SI unit of mole.
- First we should know the definition of a mole.
- One moles of any atom or molecule contains Avogadro number of atoms or molecules in it.
- We can define the mole in another way that a substance may contain somany numbers of atoms or contains exactly the 12 gram of the Carbon-12 isotope.
- To know about the SI unit we will start discussion as per the given options.
- Coming to given options, option A, mol. mol is the shortest form of mole and can be used in the SI system to denote mole.
- Come to option B, Mole. Mole is the full form to measure the number of atoms or molecules present in the given substance. So, option B is wrong.
- Coming to option C, M. M means molarity. Molarity can be defined as the number of moles of the substance which is present in the certain volume (ml) of the solvent. So, option C is wrong.
- Therefore mol is SI unit of mole to express the number of atoms of a particular substance.

So, the correct option is A.

Note:
There is another unit to express the units of various parameters that is CGS (Centimetre – gram – second). In the CGS system the units of length, mass and time are centimeter (m), gram (kg) and second (s) respectively.