Chapter 3, Problem 65QP

The amino acid cysteine plays an important role in the three-dimensional structure of proteins by forming “disulfide bridges." The percent composition of cysteine is $\text{29}\text{.74 percent C, 5}\text{.82 percent H, 26}\text{.41 percent O, 11}\text{.56 percent N, and 26}\text{.47 percent S}\text{.}$ What is the molecular formula if its molar mass is approximately 121 g?