how many atoms are contained in 12g of H2O2 ?
To find the number of atoms in 12g of H2O2, you can use the concept of molar mass and Avogadro's number.
1. Start by finding the molar mass of H2O2.
- H2O2 is composed of 2 atoms of hydrogen (H) and 2 atoms of oxygen (O).
- The atomic masses of hydrogen and oxygen are approximately 1g/mol and 16g/mol, respectively.
- So, the molar mass of H2O2 = (2 * 1g/mol) + (2 * 16g/mol) = 34g/mol.
2. Next, calculate the number of moles of H2O2 in 12g using the formula:
Number of moles = Mass (g) / Molar mass (g/mol)
Number of moles = 12g / 34g/mol ≈ 0.353 moles.
3. Finally, apply Avogadro's number to find the number of atoms.
Avogadro's number is approximately 6.022 x 10^23 atoms/mol.
Number of atoms = Number of moles * Avogadro's number
Number of atoms = 0.353 moles * (6.022 x 10^23 atoms/mol) ≈ 2.125 x 10^23 atoms.
Therefore, there are approximately 2.125 x 10^23 atoms in 12g of H2O2.
To determine the number of atoms in 12g of H2O2, we need to use the concept of moles and Avogadro's number.
First, let's find the molar mass of H2O2:
H: 1.008 g/mol (atomic mass of hydrogen)
O: 16.00 g/mol (atomic mass of oxygen)
H2O2 (hydrogen peroxide) consists of 2 hydrogen atoms and 2 oxygen atoms. So, the molar mass of H2O2 is:
(2 × atomic mass of hydrogen) + (2 × atomic mass of oxygen)
= (2 × 1.008 g/mol) + (2 × 16.00 g/mol)
= 2.016 g/mol + 32.00 g/mol
= 34.016 g/mol
Next, we can calculate the number of moles of H2O2 in 12g by dividing the mass by the molar mass:
Number of moles = Mass (g) / Molar mass (g/mol)
= 12g / 34.016 g/mol
≈ 0.3521 moles
Now, since 1 mole contains Avogadro's number (6.022 × 10^23) of particles, we can use this information to find the number of molecules or atoms.
Number of atoms = Number of moles × Avogadro's number
= 0.3521 moles × (6.022 × 10^23 atoms/mol)
≈ 2.12 × 10^23 atoms
Therefore, there are approximately 2.12 × 10^23 atoms in 12g of H2O2.
12g/molar mass H2O2 = moles H2O2.
Then moles H2O2 x 4 = atoms (2 atoms/mole for H and 2 atoms/mol for O).