B). how many mole of mercury (hg) would be produced from reacting 6 mole of hgo (mercury (ii)
oxide)?

There will be produced 6.00 moles of mercury (Hg)

Explanation:

Step 1: Data given

Number of moles Mercury (II) oxide (HgO) = 6.00 moles

Step 2: The balanced equation

2HgO → O2 + 2Hg

Step 3: Calculate number of moles of O2

For 2 moles of Mercury (II) oxide (HgO) we produce 1 mol of O2 and 2 moles of Hg

For 6.00 moles of Mercury (II) oxide (HgO) we'll have 6.00 moles of mercury (Hg)

There will be produced 6.00 moles of mercury (Hg)

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)