if 3.15g of mercury are thermally decomposed to mercury and oxygen what mass of mercury will be produced and how many oxygen molecules will be produced [hg=208,o=16]
(hg =208,0=16
2HgO ==> 2Hg + O2
mols HgO = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols HgO to mols Hg. That will be mols Hg = mols HgO x (2 mols Hg/2 mols HgO) = mols HgO x 2/2 = ?
Then grams Hg = mols Hg x atomic mass Hg = ?
Do the same for O2 to find mols O2. Convert to molecules O2 knowing that 1 mol O2 contains 6.02E23 molecules.
Thanks
To determine the mass of mercury produced and the number of oxygen molecules produced when 3.15g of mercury is thermally decomposed, we need to use the concept of molar mass and stoichiometry.
1. Calculate the number of moles of mercury:
Use the molar mass of mercury (Hg) to determine the number of moles of mercury present.
Molar Mass of Hg = 208 g/mol
Number of moles of Hg = Mass of Hg / Molar Mass of Hg
Number of moles of Hg = 3.15 g / 208 g/mol
2. Determine the stoichiometric ratio:
From the chemical equation, we can see that for every 1 mole of mercury decomposed, we get 1 mole of mercury produced and 1 mole of oxygen produced.
3. Calculate the mass of mercury produced:
Since the stoichiometric ratio is 1:1, the number of moles of mercury decomposed is equal to the number of moles of mercury produced.
So, the mass of mercury produced will also be 3.15 g.
4. Calculate the number of oxygen molecules produced:
To calculate the number of oxygen molecules produced, we need to convert the number of moles of oxygen to molecules.
Since 1 mole of any substance contains 6.022 x 10^23 molecules, we can use Avogadro's number.
Number of molecules of oxygen = Number of moles of O2 x Avogadro's number
Number of molecules of oxygen = 3.15 g / 32 g/mol(Hg) x 6.022 x 10^23 molecules/mol
Now you can substitute the values and calculate the final answers.