How many oxygen atoms are present in 2.00 millimoles of H2SO4?
To determine the number of oxygen atoms present in 2.00 millimoles of H2SO4, you need to know the molar mass of H2SO4 and the number of oxygen atoms in its chemical formula.
Step 1: Calculate the molar mass of H2SO4.
- The molar mass of hydrogen (H) is 1.01 g/mol.
- The molar mass of sulfur (S) is 32.07 g/mol.
- The molar mass of oxygen (O) is 16.00 g/mol.
To calculate the molar mass of H2SO4:
(2 * molar mass of hydrogen) + molar mass of sulfur + (4 * molar mass of oxygen)
(2 * 1.01 g/mol) + 32.07 g/mol + (4 * 16.00 g/mol) = 98.09 g/mol
So, the molar mass of H2SO4 is 98.09 g/mol.
Step 2: Calculate the number of moles of H2SO4.
Given that you have 2.00 millimoles of H2SO4, you need to convert it to moles by dividing it by 1000 since there are 1000 millimoles in a mole.
2.00 millimoles / 1000 = 0.002 moles
So, you have 0.002 moles of H2SO4.
Step 3: Determine the number of oxygen atoms using Avogadro's number.
Avogadro's number (6.02 x 10^23) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.
Since the chemical formula of H2SO4 contains four oxygen atoms, the number of oxygen atoms in 0.002 moles of H2SO4 will be:
0.002 moles * (6.02 x 10^23 atoms/mole) * 4 atoms = 4.82 x 10^21 oxygen atoms
Therefore, there are approximately 4.82 x 10^21 oxygen atoms present in 2.00 millimoles of H2SO4.