Answer to Question #107600 in Inorganic Chemistry for OWOLABI

Question

If 3.15g of mercury oxide are thermally decomposed to mercury and oxygen
(a) What mass of mercury will be produced?
(b) How many oxygen molecules will be produced?

Answer 1

$$2HgO = 2Hg + O_2$$

$$n(HgO) = n(Hg) = 0.5n(O_2)$$

$$n(HgO) = {m \over M} = {3.15 \over 216.59} = 0.0145mol$$

$$m(Hg) = nM = 0.0145*200.59 = 2.91 g$$

$$N(O_2) = 0.5nN_A = 0.5*0.0145*6.02*10^{23} = 4.3645*10^{21}$$

Answer: (a) 2.91g; (b) 4.3645*10²¹.