A sample weighing 2.198 g containing a mixture of and takes 0.015 mole of to oxidize…

CHEMISTRY · Subjective · AP · Chemistry · Chemical Reactions · Chemical Reactions

Problem

A sample weighing 2.198 g containing a mixture of

\text{AO}

and

\text{A}_2\text{O}_3

takes 0.015 mole of

\text{K}_2\text{Cr}_2\text{O}_7

to oxidize the sample completely to form

\text{AO}_4^-

and

\text{Cr}^{3+}

. If 0.0187 mole of

\text{AO}_4^-

is formed, what is atomic mass of A?