Question

Calculate the number of molecules of sulphur (S₈) present in 16g of solid sulphur

Answer 1

 1 mole of solid sulphur (S₈) = 8 × 32_g = 256_g 

i.e., 256g of solid sulphur contains = 6.022 × 10²³ molecules 

Then, 16g of solid sulpur contains 6.022×10²³ /256 × 16 molecules 

= 3.76 × 10²² molecules (approx)