hòa tan hoàn toàn 14,6g hỗn hợp Zn và ZnO bằng dung dịch HCL thu được 22,4l hiddro( đktc) Hãy tính phần trăm khối lượng mỗi chất trong hỗn hợp ban đầu

The answer is probably c. xylem

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.