The natural isotopes of sulfur are listed below:
³²S, 94.99%, 31.972 amu
³³S, 0.75%, 32.971 amu
³⁴S, 4.25%, 33.968 amu
³⁶S, 0.01%, 35.967 amu
Calculate the atomic weight of sulfur.

• A. 31.931 amu
• B. 33.529 amu
• C. 32.065 amu
• D. 34.744 amu

Answer: (C)