How many moles of oxygen are there in 23.5g of H2SO4? (numbers are subscripts)How many oxygen atoms? How many grams of oxygen?
23.5 g H2SO4 = ?? moles.
23.5/98 = ?? moles H2SO4.
There are 4 moles O atoms in 1 mole H2SO4; therefore, moles H2SO4 x 4 = ??
There are 6.02 x 10^23 atoms in a mole of atoms; therefore, # moles oxygen atoms x 6.02 x 10^23 atoms = ??
grams oxygen = moles oxygen x 16 g/mole = ??
MASS OF OXYGEN IN 23.5g of H2SO4=2(M of oxygen)/M of H2SO4
=2(16g/mol)/2(1)+32.07+4(16)
=32/98.07
=0.33 grams
n=m/M
n=0.32g/16 g/mol
n=0.02 moles
number of oxygen atoms=number of moles(Avogadro's constant)=0.02moles( 6.02*10^23)
=1.22............... you know
To determine the number of moles of oxygen in 23.5g of H2SO4, we need to use the molar mass of H2SO4 and the stoichiometry of the formula.
The molar mass of H2SO4 can be calculated by summing the atomic masses of each element in the compound. The atomic masses are found on the periodic table.
H2SO4 consists of:
- 2 hydrogen atoms with an atomic mass of 1g/mol, totaling 2g/mol (2 x 1)
- 1 sulfur atom with an atomic mass of 32 g/mol, totaling 32g/mol
- 4 oxygen atoms with an atomic mass of 16g/mol each, totaling 64g/mol (4 x 16)
Summing these masses together gives us the molar mass of H2SO4:
2g/mol (Hydrogen) + 32g/mol (Sulfur) + 64g/mol (Oxygen) = 98g/mol.
Now, to find the number of moles of oxygen in 23.5g of H2SO4, we use the given mass and the molar mass of H2SO4:
Moles = Mass / Molar Mass
Moles of H2SO4 = 23.5g / 98g/mol
Dividing these values yields:
Moles of H2SO4 = 0.239 mol
Since H2SO4 has a 1:4 stoichiometric ratio with oxygen (1 mole of H2SO4 contains 4 moles of oxygen), we can multiply the number of moles of H2SO4 by 4 to find the number of moles of oxygen:
Moles of oxygen = 0.239 mol of H2SO4 x 4 moles of O2 / 1 mole of H2SO4
Moles of oxygen = 0.956 mol
Therefore, there are 0.956 moles of oxygen in 23.5g of H2SO4.
To calculate the number of oxygen atoms, we use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, ions, etc.).
Number of oxygen atoms = Moles of oxygen x Avogadro's number
Number of oxygen atoms = 0.956 mol x 6.022 x 10^23 atoms/mol
Number of oxygen atoms = 5.75 x 10^23 atoms
As for the mass of oxygen, we multiply the number of moles of oxygen by the molar mass of oxygen:
Mass of oxygen = Moles of oxygen x Molar mass of oxygen
Mass of oxygen = 0.956 mol x 16g/mol (molar mass of oxygen)
Mass of oxygen = 15.296g
Therefore, there are 0.956 moles of oxygen, 5.75 x 10^23 oxygen atoms, and 15.296g of oxygen in 23.5g of H2SO4.