The pKa of dihydrogen phosphate (H2PO4−) is 7.21. If a pH 8.0 buffer is made from the protonated and de-protonated forms of H2PO4−, what is the ratio of the de-protonated to protonated form of H2PO4− at the buffer pH? The Henderson-Hasselbalch equation is pH = pKa + log ([A–]/[HA]). Work out the problem on a separate piece of paper and upload a photo of your response at the end of the test. Please mark the problem clearly and show your work. Enter the ratio in the box below.  

Calculate the mass of 5-FU required to make 300 mL of an injectable solution of 5-FU at a concentration of 0.05 M. Work out the problem on a separate piece of paper and upload a photo of your response at the end of the test. Please mark the problem clearly and show your work. Enter the mass in the box below.   ___________ g of 5-FU

Platinum-197 undergoes beta emission. Write out this nuclear reaction showing the resulting product(s).  You may submit your response in the box below using the text editing tools or upload a photo of a written response at the end of the test. Please mark the problem clearly.  

Platinum-191 undergoes electron capture. Write out this nuclear reaction showing the resulting product(s).  You may submit your response in the box below using the text editing tools or upload a photo of a written response at the end of the test. Please mark the problem clearly.

Another anticancer drug is cisplatin, Pt(NH3)2Cl2. Calculate the formula mass of this compound. Work out the problem on a separate piece of paper and upload a photo of your response at the end of the test. Please mark the problem clearly and show your work. Enter the formula mass in the box below. _____________g/mol

How many grams of sucrose (table sugar: C12H22O11; molar mass: 342.3 g/mol) are there in 75.0 mL of 0.150 M aqueous solution of table sugar?

Rank the 3d, 3p, 3s, 4p, 4s, 4d orbitals in the order they typically fill, going from the lowest energy orbitals to the highest energy orbitals:

Rank the following bonds and intermolecular forces in order of increasing strength (weakest first and strongest last): covalent bond, London dispersion forces, dipole–dipole forces, and hydrogen bonds.

The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc = 2 × 1011. This means that the reaction mixture at equilibrium is likely to consist of ________.

The conjugate base of HClO3 is ________.