Why is a solution of 4% acetic acid in 95% ethanol used to wash the crude aldol-dehydration product? (b) the choice of an appropriate solvent is crucial for a successful recrystallization. describe how you will determine the proper recrystallization solvent for your product in project 11.1?

Carbon based or cells?

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.

As long as you're breathing, you'll be fine : /p. s. if you aren't breathing, you'll pass out. mark as brainliest.