Answer: Number of molecules = mass x 6.022 x 10²³/ molar mass =0.5 x 6.022 x 10²³/76.2=3.95 x 10²¹
Explanation: Number of moles = mass/ molar mass=number of molecules/ 6.022 x 10²³
Hence number of molecules = mass x 6.022 x 10²³/ molar mass =0.5 x 6.022 x 10²³/76.2=3.95 x 10²¹