need help answering these 2

Enter your answer in the provided box. Element X has two naturally occurring isotopes, 65x (isotopic mass 64.7859 amu, abundance 66.55%) and ?X (isotopic mass 67.3429 amu, abundance 33.45%). Calculate the atomic mass of element X. amu Be sure to answer all parts. Enter your answer in scientific notation. Carry out the following calculation, paying special attention to significant figures, rounding, and units (J = joule, the SI unit of energy; mol = mole, the SI unit for amount of substance): (6.626 X 10-34 Js)(2.9979 x 10 m/s) 6.49 x 10-7 m x 10