Iodine-131 has a half-life of 8.1 days. How many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

Determine the vapor pressure of a solution at 25°C that contains 85.3 g of naphthalene (128.1705 g/mol) in 540 g of benzene (78.11 g/mol). The vapor pressure of benzene at 25°C is 74.6 torr.

Radon-220 decays to polonium-216. What particle is emitted?

Using the following data, determine the standard cell potential for the electrochemical cell constructed based on the following unbalanced reaction expression: .Half-reaction                     Standard reduction potential                       −1.662 V                     −0.277 V

Which is the strongest acid?  

Which is the strongest acid?  

When 10.0 g cholesterol was dissolved in 0.500 kg cyclohexane (C6H12, 84.18 g/mol, Kf = 20.2°C/m, Tf = 6.55°C), the freezing point of the solution was 5.50°C. What is the approximate molar mass of cholesterol?

Nitrogen-13 decays by positron emission to produce

Consider the following reaction at equilibrium. What effect will reducing the volume of the reaction mixture have on the system? Xe(g) + 2 F2(g) → XeF4(g)

Consider the following reaction at equilibrium. What effect will reducing the volume of the reaction mixture have on the system? Xe(g) + 2 F2(g) → XeF4(g)