Answer:
1.350996E23 or 1.350996*10^23 atoms
Step-by-step explanation:
to find the total number of atoms we need to find the number of moles present in 45grams of mercury and since the molar mass of mercury is given as 200.59 grams . we can calculate :
number of moles=mass/molar mass
=45g/200.59 g
=0.224338
to find the amount of atoms , we multiply the number of moles with the Avogadro's number
=0.224338*6.02214076*10^23
=1.350996*10^23 atoms