A compound of Cr3+ and C2O4 2– is made by a reaction that involves Na2CrO4 and oxalic acid, H2C2O4, a reducing agent. The sodium chromate has an activity of 765 counts per minute per gram, from Cr-51. The oxalic acid has an activity of 512 counts per minute per gram. It is labeled with C-14. Because Cr-51 and C-14 emit different particles during decay, their activities can be counted independently. A sample of the compound was found to have a Cr-51 count of 314 cpm and a C-14 count of 235 cpm. How many oxalate ions are bound to one Cr3+ ion?
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