how to find the volume of oxygen at STP from the Deoomposition of 10.8 g of mercuric oxide?
2HgO ==> 2Hg + O2
2. Convert 10.8 g HgO to moles. moles = grams/molar mass.
3. Using the coefficients in the balanced equation, convert moles HgO to moles O2.
4. Convert mols O2 to volume. L = 22.4 L/mol x moles
To find the volume of oxygen at STP (Standard Temperature and Pressure) from the decomposition of mercuric oxide, you will need to follow these steps:
1. Determine the molar mass of mercuric oxide:
- Mercuric oxide (HgO) is composed of one mercury atom (Hg) and one oxygen atom (O). The molar mass of mercury is 200.59 g/mol, and the molar mass of oxygen is 16.00 g/mol. Therefore, the molar mass of mercuric oxide is:
Molar mass of HgO = (1 × molar mass of Hg) + (1 × molar mass of O)
= (1 × 200.59 g/mol) + (1 × 16.00 g/mol)
= 216.59 g/mol
2. Calculate the number of moles of mercuric oxide:
- Moles = Mass / Molar mass
- Given that the mass of mercuric oxide is 10.8 g, the number of moles can be calculated as follows:
Moles of HgO = 10.8 g / 216.59 g/mol
3. Apply the stoichiometry of the reaction:
- The balanced chemical equation for the decomposition of mercuric oxide is:
2HgO → 2Hg + O₂
- From the equation, we see that two moles of mercuric oxide produce one mole of oxygen gas (O₂). Therefore, the number of moles of oxygen gas produced can be calculated as follows:
Moles of O₂ = (Moles of HgO) / 2
4. Use the ideal gas law to find the volume of oxygen at STP:
- The ideal gas law is given by the equation PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
- At STP, the pressure (P) is 1 atm (atmosphere), and the temperature (T) is 273.15 K (Kelvin).
- Rearranging the ideal gas law equation, we get V = (nRT) / P. Substituting the values, we can find the volume of the oxygen gas:
Volume = [(Moles of O₂) × (R) × (T)] / P
By following these steps, you will be able to calculate the volume of oxygen at STP from the decomposition of 10.8 g of mercuric oxide.