Chromium has an atomic mass of 51. 9961 u and consists of four isotopes, Cr50, Cr52, Cr53, and Cr54. The Cr52 isotope has a natural abundance of 83. 79% and an atomic mass of 51. 9405 u. The cr54 isotope has a natural abundance of 2. 37% and an atomic mass of 53. 9389 u. The natural abundances of the Cr50 and Cr53 isotopes exist in a ratio of 0. 4579:1, and the Cr50 isotope has an atomic mass of 49. 9460 u. Required:
Determine the atomic mass of the cr53 isotope.