Write a sentence that descrices how to determine the number of moles of a compound in known mass of a

compound if we know its molecular formula

Moles is denoted by given mass divided by the molecular mass,

Hence,

n = w / m

n = moles,

w = given mass,

m = molecular mass.

For example,

For a compound X,

The given mass i. e. w = 20 g

and the molecular mass, i. e., m = 10 g / mol

Then the moles can easily be calculated by using the above formula,

n = w / m

n = 20 g / 10 g/mol = 2 mol

Hence, answer = 2 mol.