The half-life for the radioactive decay of Ce−141 is 32.5 days. If a sample has an activity of 4.0 μCi after 130 d have elapsed, what was the initial activity, in microcuries, of the sample? Express your answer using two significant figures.

Percent ionization for a weak acid (ha) is determined by the following formula: percent ionization=[ha] ionized[ha] initial×100%for strong acids, ionization is nearly complete (100%) at most concentrations. however, for weak acids, the percent ionization changes significantly with concentration. the more diluted the acid is, the greater percent ionization.a certain weak acid, ha, has a ka value of 9.4×10? 7.part acalculate the percent ionization of ha in a 0.10 m solution.part bcalculate the percent ionization of ha in a 0.010 m solution