Final answer:
The molecular weight of hydrogen peroxide (H₂O₂) is calculated by summing the atomic weights of hydrogen and oxygen, yielding a molecular weight of approximately 34.014 u, which is rounded to 34.02 u.
Step-by-step explanation:
To determine the molecular weight of hydrogen peroxide (H₂O₂), we need to sum the atomic weights of its constituent elements. Hydrogen has an atomic weight of approximately 1.008 u and oxygen has an atomic weight of approximately 15.999 u. Hydrogen peroxide has two atoms of hydrogen and two atoms of oxygen.
Molecular weight of H₂O₂ = (2 × atomic weight of H) + (2 × atomic weight of O)
Molecular weight of H₂O₂ = (2 × 1.008 u) + (2 × 15.999 u)
Molecular weight of H₂O₂ = (2.016 u) + (31.998 u)
Molecular weight of H₂O₂ = 34.014 u
Therefore, the correct answer, rounded to two decimal places, is c. 34.02 u.