What volume of oxygen, measured at STP, can be prepared by heating 2.16g HgO?

Answer 1

1. Write and balance the equation.
2. Convert g HgO to mols. mols = g/molar mass.
3. Using the coefficients in the balanced equation, convert mols HgO to mols O2.
4. Now convert mols O2 to volume. 1 mol O2 occupies 22.4 L at STP.