How many moles of mercury (II) oxide are needed to produce 125g of oxygen gas?

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ado s

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im really struggling with chemistry and would really like if someone could help me. Im taking this through an online course and i dont have an intructor to show me how its done.
 
2 HgO >> 2 Hg + O2
moles O2 = 125 g / 32 g/mol =3.91
the ratio between HgO and O2 is 2:1
moles HgO needed = 2 x 3.91 =7.82
 
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