Question

Calculate the number of molecules in 100g of Sulphur.​

Answer 1

no.of moles (n)= ?

mass of substance= 100g

molar mass of substance= ?

no.of moles= mass of substance / molar mass of of substance

molar mass of sulphur is 32

mol (n)= 100g/ 32 g/mol

= 3.12 mol

no.of molecules= n× Nà

= 3.12×6.022×10²³

=18.79×10²³ molecules