1. if 100 ML of a 12.0 M HCL solution is diluted to 2.00 L, what is the molarity of the final solution?​

It’s 0.6
Explanation :
M1V1=M2V2 so ==> 12 *0.1= 2* M2

Because you ate playdough

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.