# Chapter 10 Gases and Their Properties - Study Questions - Page 403h: 98

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#### Work Step by Step

Number of moles of $CO_2$: $n=PV/RT$ $n=(69.8/760×1\ atm)×0.285\ L\div((0.082)(298\ K))$ $n=0.00107\ mol$ This is also the number of moles of the carbonate. The molar mass of the compound is: $0.158\ g/0.00107\ mol=147.60\ g/mol$ Since $CO_3^{2-}$ has a molecular weight of $60.01\ g/mol$, it follows: Atomic weight of M: $147.60-60.01=87.59\ g/mol$ Which is closest to Strontium's atomic weight.

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