How many miles are there in 20g of KClO3 (k=39 Cl=35.5 O=16)

0.144 moles

Explanation: The relationship between mass of a compound, number of moles and molar mass of the compound is given by; Number of moles = Mass : Molar mass Molar mass is equivalent to the relative formula mass of the compound that is calculated the atomic masses of the elements making the compound.

In this case;

Our compound, KClO3 will have a molar mass of;

= 39 + 35.5 + 4 (16)

= 138.5 g/mol

Mass of KClO3 is 20 g

Therefore;

Number of moles = 20 g : 138.5 g/mol

= 0.144 moles

Thus, the number of moles in 20 g of KClO3 is 0.144 moles