Fictitious element Az has two common isotopes. What is the average atomic mass (in amu) of Az given that seven-ninth of the isotopes have a mass of 325.2 amu, while the rest have a mass of 329.6 amu? Report the answer to 4 significant figures.

Fictitious element Az has two common isotopes What is the average atomic mass in amu of Az given that sevenninth of the isotopes have a mass of 3252 amu while t class=