Question

1 mole of chlorine molecule has a mass of 71 grams? Explain.

Answer 1

In the International System of Units, the mole is the unit of measurement for the amount of substance. It is known as a set of exactly 6.02214076 x ${10^{23}}$ particles, which may be atoms, molecules, ions, or electrons.
The molar mass of any element can be calculated by looking up the element's atomic mass on the periodic table.

Complete answer: In the International System of Units, the mole is the unit of measurement for the amount of substance. It is known as a set of exactly 6.02214076 x ${10^{23}}$ particles, which may be atoms, molecules, ions, or electrons.
The molar mass of any element can be calculated by looking up the element's atomic mass on the periodic table.
The mass of one mole of atoms of that element in grams is known as grain atomic mass. A mole was previously referred to as a "gram atom." This is a dimensionless quantity equal to the molar mass divided by the molar mass constant (i.e., a pure number without units).
Chlorine is a halogen and an elemental gas that exists as $C{l_2}$. Gram molecular weight is the mass in grams of the substance numerically equal to the molecular weight.
1 mole of $C{l_2}$ = 2 moles of Cl atom
Atomic mass of Cl = 35.5
Atomic mass of $C{l_2}$ = 2 x 35.5 = 71 g = Gram molecular weight.

Note:
The mass of one mole of atoms of that element in grams is known as grain atomic mass. A mole was previously referred to as a "gram atom." This is a dimensionless quantity equal to the molar mass divided by the molar mass constant (i.e., a pure number without units).