Im not really sure how i can write the possible mole ratios of these equations.

Question

2Hgo-->2Hg+o2

and

4NH3+6NO-->5N2+6H20

Help me please!

Answer 1

2 mols HgO to 1 mol O2
1 mol HgO to 1 mol Hg.

It's all done with the coefficients.