1- El número de Avogadro se refiere al número de partículas que hay en un gramo de sustancia. (2 points)
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2- Un mol de una sustancia tiene el mismo número de partículas que un mol de cualquier otra
sustancia, independientemente de las sustancias que se comparen.
(2 points)
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The answer is not c

What are the statements?

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.