Near 2×109 K, the oxygen-burning reaction rate is approximately 2.8×10−12("T"9/2)33, where "T"9 is the temperature in billion kelvins. Overall, the major products of the oxygen-burning process are 28Si, 32,33,34S, 35,37Cl, 36,38Ar, 39,41K, and 40,42Ca. Of these, 28Si and 32S constitute 90% of the final composition. The oxygen fuel within the core of the star is exhausted after 0.01–5 years, depending on the star's mass and other parameters. The silicon-burning process, which follows, creates iron, but this iron cannot react further to create energy to support the star.