how much oxygen is produced by heating 20g of mercury (II) oxide if 18.6g of mercury is produced?
When 20 g of mercury (II) oxide was heated, it produces ________ g of oxygen.
help me on this please
What is the percent O2 in HgO ?
To determine how much oxygen is produced by heating 20g of mercury (II) oxide, we first need to calculate the amount of mercury (II) oxide that reacts and the amount of mercury that is produced. Then, we can use stoichiometry to find the amount of oxygen produced.
1. Write the balanced chemical equation for the reaction:
2 HgO → 2 Hg + O2
2. Calculate the molar mass of mercury (II) oxide (HgO):
Hg = 200.59 g/mol
O = 16.00 g/mol
Molar mass of HgO = Hg (200.59 g/mol) + O (16.00 g/mol) = 216.59 g/mol
3. Calculate the moles of mercury (II) oxide:
moles of HgO = mass of HgO / molar mass of HgO
moles of HgO = 20 g / 216.59 g/mol = 0.0921 mol
4. Determine the moles of mercury produced:
From the balanced equation, we can see that 2 moles of mercury (Hg) are produced for every 1 mole of mercury (II) oxide (HgO).
moles of Hg = 0.0921 mol HgO × (2 mol Hg / 1 mol HgO)
moles of Hg = 0.1842 mol
5. Calculate the mass of mercury produced:
mass of Hg = moles of Hg × molar mass of Hg
mass of Hg = 0.1842 mol × 200.59 g/mol = 36.90 g
6. Determine the moles of oxygen produced:
From the balanced equation, we can see that 1 mole of oxygen (O2) is produced for every 1 mole of mercury (II) oxide (HgO).
moles of O2 = 0.0921 mol HgO × (1 mol O2 / 1 mol HgO)
moles of O2 = 0.0921 mol
7. Calculate the mass of oxygen produced:
mass of O2 = moles of O2 × molar mass of O2
mass of O2 = 0.0921 mol × 32.00 g/mol = 2.95 g
Therefore, when 20g of mercury (II) oxide is heated, 2.95g of oxygen is produced.