Question

What is the theoretical yield (in grams) of HgO if 245 g of Hg are reacted with 245 g of O2?

Answer 1

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

first calculate the limiting reagent.

according to balanced reaction

2 x 200.59 g Hg reacts with 32 g O2

245 g Hg reacts with 245 x 32 / 2 x 200.59 = 19.54 g O2

but we have exess O2 present

limiting reagent = Hg

2 x 200.59 g Hg forms 216.59 HgO

245 g HgO g Hg forms 245 x 216.59 / 2 x200.59 = 132.27 g HgO

mass of HgO formed = 132.27 g