How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)?
the molecular weight of H2O2 = 2*1 +2*16 =34
therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules
there are 2 H atoms per molecule, so multiply 2x6.47xNa to get the final answer (Na=Avogadros Number)...
but for some reason it isn't given the right answer
I agree with your method. Keep four significant figures and round to three when you are done. You might want to use 1.008 for the H atomic weight, but it won't make a lot of difference.
To calculate the number of atoms of hydrogen in 220g of hydrogen peroxide (H2O2), you need to follow these steps:
1. Determine the molar mass of H2O2 by adding up the atomic masses of all the atoms in the molecule.
Atomic mass of hydrogen (H) = 1 g/mol
Atomic mass of oxygen (O) = 16 g/mol
Molar mass of H2O2 = 2(1 g/mol) + 2(16 g/mol) = 34 g/mol
2. Determine the number of moles of H2O2 by dividing the given mass by the molar mass.
Moles of H2O2 = 220 g / 34 g/mol = 6.47 mol
3. Use Avogadro's number to convert moles of H2O2 to molecules of H2O2.
Number of molecules of H2O2 = 6.47 mol x (6.022 x 10^23 molecules/mol) = 3.89 x 10^24 molecules
4. Finally, multiply the number of molecules of H2O2 by the number of hydrogen atoms per molecule (2) to get the total number of atoms of hydrogen.
Number of hydrogen atoms = 3.89 x 10^24 molecules x 2 atoms/molecule = 7.78 x 10^24 atoms
Therefore, there are approximately 7.78 x 10^24 atoms of hydrogen in 220g of hydrogen peroxide (H2O2).
To calculate the number of atoms of hydrogen in 220g of hydrogen peroxide (H2O2), you need to follow these steps:
1. Determine the molar mass of hydrogen peroxide (H2O2). The molecular weight of H2O2 can be calculated by adding the atomic masses of its constituent elements: (2 * atomic mass of hydrogen) + (2 * atomic mass of oxygen). Since hydrogen has an atomic mass of 1 and oxygen has an atomic mass of 16, the molecular weight of H2O2 is 2 * 1 + 2 * 16 = 34 grams/mol.
2. Calculate the number of moles of hydrogen peroxide using the given mass and the molar mass. In this case, 220g / 34 g/mol = 6.47 mol.
3. Use Avogadro's number, which is approximately 6.022 × 10^23 molecules/mol, to convert the number of moles of hydrogen peroxide to the number of molecules. Multiply the number of moles by Avogadro's number: 6.47 mol * (6.022 × 10^23 molecules/mol) = 3.89 × 10^24 molecules.
4. Since there are 2 hydrogen atoms in each molecule of hydrogen peroxide, multiply the number of molecules by 2 to find the total number of atoms of hydrogen: 3.89 × 10^24 molecules * 2 hydrogen atoms/molecule = 7.78 × 10^24 atoms of hydrogen in 220g of hydrogen peroxide.
Therefore, there are approximately 7.78 × 10^24 atoms of hydrogen in 220g of hydrogen peroxide.