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A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top secret. The company is interested in the drug's Ka value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. To find the pKa of X-281, you prepare a 0.086 test solution of X-281. The pH of the solution is determined to be 3.00. What is the pKa of X-281?
Suppose you have a sample of sodium weighing 11.42 g. How many atoms of sodium are present in the sample.
3 isotopes of argon occur in nature. Ar-36, Ar-38, and Ar-40. The abundance of each are as follow: 0.34%, 0.07%, and 99.59%.
The element cesium (Cs) freezes at 28.4 degree celsius, and its molar enthalpy of fusion is delta H fusion =2.09kJ/mol. a.) when molten cesium solidifies to Cs (s) at its normal melting point, is delta S positive or negative? b.)calculate the valu..
when 50.0 gram of metal at 75.0 C is added to 100 grams of water at 15.0 C the temperature of the water rises to 18.3 C. Assume that no heat is lost to the surroundings. What is the specific heat of this metal
What is the pH of the solution? The K of hypochlorous acid is 3.8*10-8. Please explain how to get this using the Henderson-Hassalbach Equation.
If all of these tires were burned with complete efficiency, by how much (in tonnes) would Earth's current atmospheric load of C02 increase
How much heat is required to vaporize 18.5g of water at 100c. The heat of vaporization of water at 100c is 40.7kj/mole.
The decomposition of nitramide, O2NNH2, in water has the following chemical equation and rate law. O2NNH2 (aq) yields N2O (g) + H2O (l) rate= [O2NNH2]/[H]
Sodium ethoxide, NaOCH2CH3, contains both covalent and ionic bonds,
Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the C^14 has decayed to 1/16.0 of the original amount. How long ago was this plant alive. Express your answer numerically in years.
The molar volume of the liquid at this temperature and pressure is 163.3 cm^3/mol. At 100 atm the melting temp changes to 351.26 K. Calculate the enthalpy and entropy of fusion of the solid.
A solution containing 82.0 g of ascorbic acid dissolved in 230 g of water has a density of 1.22 g/mL. Calculate the molarity of ascorbic acid in the solution.
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