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Ar is a solid below -189 oC with a face-centered cubic array of atoms and a supposed density of 2.29 g/cm3. Assuming that the atoms are spheres in contact along the face diagonal, what is the radius of a Ar atom (in Angstroms)? An angstrom = 10-10 m or 10-8 cm. Hint, first find the length of an edge of the unit cell
Diethylamine, (C2H5)2NH, is a weak base (pKb=3.16 at 25oC). What is the pH of 0.155 mol/L (C2H5)2NH(aq) at 25oC
Elemental analysis of the solid suggested the composition C9H10O3. The solid melted at 117 °C and gave the following nmr spectra and the ir spectrum. What is this material and why and how did it come to be in both of these sources?
What proportion of benzoic of benzoic should be used with an equimolar mixture of adipic acid and hexamethylene diamine to produce a polymer of 10,000 molecular weigh at 99.5% conversion?
If 5.36 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield?
To measure the sample, 1.00 mL of a standard sample of butyl benzoate containing 2.59 mg/mL was mixed with 1.00 mL of the plant stream material, and analysis of the mixture gave a peak area of 463 for peak A and 425 for peak B. What is the concent..
Calculate the transmittance of 162-nm radiation through a sample of ethylene gas at 25 oC and 10 torr for a cell length of (a) 1.0 cm; (b) 10 cm.
What minimum mass of succimer in milligrams is needed to bind all of the lead in a patient's bloodstream. Assume that patient blood lead levels are 0.530 mg/L , that total blood volume is 5.0 L , and that 1 mol of succimer binds 1 mol of lead.
A first-order reaction had a rate constant , k , of 0.0123 1/s. If the initial concentration of reactant is 1.25M , what will be the concentration of reactant after 10 minutes?
Calculate the pH of the 0.20 M NH/0.26 M NHCl buffer. What is the pH after the addition of 20.0 mL of 0.050 M NaOH to 90.0 mL of the buffer solution? The Kb of ammonia is 1.8 x 10-5.
Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h.
Write the chemical equation for the reaction of the basic ion with water to produce hydroxide ion. 1. NaC2H3O2 2. NaHCO3 3. Na2CO3 4. NH4Cl
A voltaic cell is constructed that uses the following reaction and operates at 298 K. (Ered Ni+2 is -0.277) Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a) What is the emf of this cell under standard conditions?
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