The astronaut then measures the abundance of magnesium on the new planet, obtaining the following results: Isotope Abundance (%) Mass (amu) 24Mg 78.99 23.99 25Mg 10.00 24.99 26Mg 11.01 25.98 What is the atomic mass of magnesium for this planet? Express your answer to two decimal places, and include the appropriate units.
A. 23.98 amu
B. 24.31 amu
C. 24.99 amu
D. 25.62 amu