1) How many years are there in 1 mole of seconds? Use conversion factors, and show which units cancel. 6.022 x 10^23 sec x 1 min/60 sec/ 1 hr/60 min/1 day/24 hr/1 yr/365 days = 6.022 x 10 ^23 sec 1.004 x10 ^23/60 sec/1.673 x 106
2) Calculate the number of particles in each of the following:
(a) 0.125 mole zinc atoms, Zn 0.125mole zn/ 1 mole x 65.39 zn = 8.17375 or 81.74 g zinc
(b) 0.250 mol chlorine molecules, Cl2 0.250 mole cl/1 mole x 70.9 cl
(c) 0.675 mole zinc chloride formula units, ZnCl2