The principal component of many kidney stones is calcium oxalate,CaC2O4. A kidney stone recovered from a typical patient contains 8.50×10^20 formula units of calcium oxalate.

Question

How many moles of CaC2O4 are present in this kidney stone?

Answer 1

1 mole = 6.02x10²³

so, how many moles in the kidney stone?

8.5x10²⁰/6.02x10²³
= 1.41x10^-3 = 0.00141