Read the following chemical equation AI+CI2=AICI3 which of the following fractions can be used for the mole ratio to determine the mass of AI from a known mass of AICI3?
A. 2/1
B. 3/2
C. 2/2
D. 2/3

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.

#2- the hno3 has a h+ ion and the naoh has an oh- ion