You add 4 drops (i.e. a total of 0.4 mL or 0.0004 L) of 10 M NaOH to 0.0096 L of pure water – i.e. you prepare exactly 1.0L of solution. At equilibrium the solution pH is?  (You may assume KW = 1×10-14)

The half-life for the transmutation of Radon-222 () to Lead-214 ()  is 3.8 days.  If  there is an initial mass of 100.0 g of Radon-222, how much Radon-222 would remain after 1.9 days?

The product of electron capture by Polonium-218 () is:

Identify whether each of the following constant temperature and pressure processes/reactions listed below result in an increase (∆S > 0) or decrease (∆S < 0) in the system's entropy

You prepare a saturated solution of sodium carbonate (Na2CO3) by adding a large mass of it to a beaker of pure water where the following dissolution reaction occurs: Na2CO3(s) ßà 2Na+(aq) + CO32-(aq); KSP = 120 at 298K Given a solubility product equal to 120 (i.e. KSP = 120 ),the equilibrium molarity of Na+(aq) ions in the saturated solution will be:       

Lead-214 () can result from Radon-222 ()  undergoing:

Using the following table of average bond enthalpies, calculate the value of △H{“version”:”1.1″,”math”:”△H”} for the chemical reaction shown here: 2NH3 → N2 + 3H2 Note: the bonding for N2 is a triple N≡N bond; all other bonds are single covalent bonds

You add 0.04 moles of the weak acid formic acid (pKA = 3.75) to 1L of H2O, at equilibrium the pH would be:

For the following chemical reaction: 3 CO2(g) + 10 H2(g)  à  C3H8(g) + 6 H2O(l)   utilize the provided table of thermodynamic data to calculate the standard state reaction enthalpy . 

The half-life for the transmutation of Radon-222 () to Lead-214 ()  is 3.8 days.  If there is an initial mass of 100.0 g of Radon-222, how much Radon-222 would remain after 7.6 days?