Sodium (Na) and chlorine (CI) can react chemically to form table salt (NaCl). How does the mass of the table salt formed in this reaction compare to the mass of the sodium and chlorine before the reaction takes place?

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.

Deposition  is  change of state has the wrong energy change listed