Question

pls answer my question​

Answer 1

No. of moles = given mass/ molar mass

                     = 16/32 x 10^-6

                     = 5 x 10^5 g/mole

no. of molecules = no. of moles x avagadro's constant

                            =  5 x 10^5 x 6.022 x 10^23

                            = 3.011 x 10^29 molecules