Calculate the number of moles of molecules in 20.11 g of oxalic acid. H2C2O4 calculate the number of oxygen atoms in 20.11 g of oxalic acid
moles H2C2O4 = grams/molar mass
#molecules H2C2O4 = moles x 6.022E23.
# oxygen atoms = number of H2C2O4 molecules x 4.
To calculate the number of moles of molecules in 20.11 g of oxalic acid (H2C2O4), we need to use the formula:
Number of moles = Mass of substance / Molar mass of substance
To find the molar mass of oxalic acid (H2C2O4), we need to determine the atomic mass of each element in the compound and then add them up.
Molar mass of H (Hydrogen) = 1.0079 g/mol (approximately)
Molar mass of C (Carbon) = 12.0107 g/mol (approximately)
Molar mass of O (Oxygen) = 15.999 g/mol (approximately)
Since there are 2 hydrogens, 2 carbons, and 4 oxygens in one oxalic acid molecule, we can calculate the molar mass as follows:
Molar mass of H2C2O4 = (2 * Molar mass of H) + (2 * Molar mass of C) + (4 * Molar mass of O)
= (2 * 1.0079) + (2 * 12.0107) + (4 * 15.999)
= 2.0158 + 24.0214 + 63.996
= 90.0332 g/mol (approximately)
Now that we have the molar mass of oxalic acid, we can calculate the number of moles of molecules in 20.11 g:
Number of moles = Mass of substance / Molar mass of substance
= 20.11 g / 90.0332 g/mol
≈ 0.2233 moles
Therefore, there are approximately 0.2233 moles of oxalic acid molecules in 20.11 g of oxalic acid.
To calculate the number of oxygen atoms in 20.11 g of oxalic acid, we need to consider that there are 4 oxygen atoms in one molecule of oxalic acid (H2C2O4).
To find the number of moles of oxygen in 20.11 g of oxalic acid, we can use the calculated number of moles from above:
Number of moles of oxygen = Number of moles of oxalic acid * Number of oxygen atoms in one molecule
= 0.2233 moles * 4
= 0.8932 moles
Since one mole contains 6.022 x 10^23 particles (Avogadro's number), we can calculate the number of oxygen atoms:
Number of oxygen atoms = Number of moles of oxygen * Avogadro's number
= 0.8932 moles * (6.022 x 10^23 atoms/mol)
≈ 5.377 x 10^23 atoms
Therefore, there are approximately 5.377 x 10^23 oxygen atoms in 20.11 g of oxalic acid.