a) 12 molecules co₂
b) 6.02x10²³ molecules co₂
c) 2.41x10²⁴ molecules co₂
d) 1.20x10²⁴ molecules co₂

The correct answer you are looking for is B) 6.02x10²³ molecules CO₂.
molecules / mole times 4 moles 

Good luck with your studies, I hope this helps~!

What are the statements?

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.