A sample of natural sulfur consists of three isotopes:

95.0% sulfur-32 (31.97 amu)
0.75% sulfur-33 (32.97 amu)
4.21% sulfur-34 (33.96 amu)

Based on this information, what is the average molar mass of sulfur?
Answer
A
31.92 g/mol

B
32.00 g/mol

C
32.80 g/mol

D
32.05 g/mol