An element has three naturally occurring isotopes with the following abundances and masses: abundance: 78.99%, mass (amu): 23.985042 abundance: 10.00%, mass (amu): 24.985837 abundance: 11.01%, mass (amu): 25.982593 Determine the atomic mass of the element a) 24.31 b) 24.98 c) 74.95 d) 2431 e) none of the above