Example: 50. OmL of monoprotic acid solution of unknown concentration is titrated with 0.32 M of NaOH. It takes 24.6 mL of this base to reach the endpoint. What is the molarity of this acid?

The half-life of Palladium-100 is 4 days. After 12 days a sample Palladium-100 has been reduced to a mass of 4 mg . What was the initial mass (in mg ) of the sample? What is the mass (in mg ) 6 weeks after the start?

(v) The strongest reducing agents are the elements of group: a. Six b. Seven .c. One d. Two

At the beginning of an experiment, a scientist has 260 grams of radioactive goo. After 210 minutes, her sample has decayed to 8.125 grams. What is the half-life of the goo in minutes? Find a formula for \( G(t) \), the amount of goo remaining at time \( t \). \( G(t)= \)

33. 15 g of magnesium ( Mg ) was reacted with 40 g of HCl to form magnesium chloride \( \left(\mathrm{MgCl}_{2}\right) \) and hydrogen gas as in the following reaction: \( \mathrm{Mg}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g}) \) Calculate the mass in gram \( (\mathrm{g}) \) of \( \mathrm{MgCl}_{2} \) formed \( \begin{array}{llll}\text { A) } 25.7 & \text { C) } 104.8 & 30.7 & \text { D) } 52.2\end{array} \)

The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 4 mg . What was the initial mass (in mg ) of the sample? What is the mass (in mg ) 8 weeks after the start? You may enter the exact value or round to 4 decimal places.