Question: Circle the answer for me. There are two naturally occurring rubidium isotopes 85Rb at 72.17% abundance with an atomic weight of 84.91amu and 87Rb at

Circle the answer for me.

There are two naturally occurring rubidium isotopes 85Rb at 72.17% abundance with an atomic weight of 84.91amu and 87Rb at 27.83% with an atomic weight of 86.91amu. Calculate the weighted average atomic mass of rubidium in amu

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