Convert 5.18 mol NaCl to moles of CaCl2, using the equation given below. Round to the nearest 0.01, and remember to include units (properly abbreviated) and substance in your answer!

Ithink the answer is d.

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.