Question

calculate the number of molecules of sulphur present in 16g of solid sulphur

Answer 1

use n = w/mw = Na/N
16/32*8=Na/N
so N = 16*Na where Na is avagadro number

Answer 2

S = 32 g S8 = 32 x 8 = 256 Now 256 g = 6.022 x 10 to the power 23 1 g. = 6.022 x 10 to the power 23/256 16 g = 6.022x10 to the power23 x 16/256 16 g = 3.76 x 10 to the power 22. 16 g = 3.76 x 10 to the power 22.

Hope it helps u