Question

When the reddish-brown mercury(ii) oxide (hgo) is heated, it decomposes to its elements, liquid mercury metal and oxygen gas. if 1.19 g hgo is decomposed to hg, calculate the mass of the pure hg metal produced. 2 hgo(s) 2 hg(l) + o2(g)?

Answer 1

2HgO-----> 2Hg + O2

find the moles of HgO,

moles=mass/molar mass

1.19g/216.59(molar mass of HgO) = 5.49 x10^-3moles

by use of mole ratio between HgO and Hg which is 2:2 or 1:1 the moles of Hg is also 5.49 x10^-3 moles

mass of Hg is therefore = (5.49 x10^-3) x 200.59 = 1.101 grams