Using the method of successive approximations, what is [h3o+] in 0.00500 m ch2clcooh(aq) (ka=1.4×10−3) and how many iterations (n) are needed to validate that a constant value had been obtained to two significant figures? express [h3o+] using two significant figures, followed by a comma and the number of iterations as an integer.

Ithink that the answer is b

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.

Ithink b not to sure hope that : )

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