¿Qué es más probable? ¿Que la masa de un objeto sea cero o que su peso sea cero?

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.

Molar mass ca = 40.078 g/mol  molar mass cacl2 = 110.984 g/mol  % ca = 40.078 x 100 / 110.984 = 36.1

Ithink d because for example there are different laws for different states but the federal government makes bigger laws like for example all states have to follow the law that no one can check your mail.