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Compute the porosity in a hollow cube of length 4R that is packed cubical arrangement with eight spheres with raduii R. If we were to fill the interstices with spheres with radii r, explain what would be the maximum value r can take?
Explain what would the resulting porosity?
The pH in a lake the size of 4.0 km X 7.0 km and an average depth of 100 m is found to be 4.5. Calculate the mass of calcium carbonate that must be added to the lake water in order to raise its pH to 6.0.
Using the information below, calculate the mass of benzene in each phase and find the total mass of benzene at the site.
A 500. mL gas sample is collected over water at a pressure of 740 mmHg and 60 °C. What is the volume of the dry gas at STP. (STP = 1 atm and 0 °C.) Vapor pressure of water at 60. °C is 149 mmHg
when a nitrite containing sample with a mass of 3.000 g was analyzed 16.65 ml of 0.1500 m na2s2o3 solution was required
Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level
Estimate the value of the equilibrium constant at 685 K for each of the following reactions. Delta H and S for BrCl(g) is 14.6 kJ/mol and 240.0 J/ mol * K, respectively. 2 NO_2(g) > N_2O_4(g.
The total molarity of acid and conjugate base in this buffer is 0.100M . A student adds 6.10 ml of a 0.280 M solution to the beaker. How much will the pH change. The pka of acetic acid is 4.760.
Suppose a 80-kg person drinks 3 L of water every day for 80 years with a arsenic concentration of 50 microgram/L. PF for arsenic is 1.75 (mg/kg-day)-1. Find the daily average dosage.
Compute the typical thermal energy of a water molecule at normal conditions: (kB T) and compare it to the answer of the previous problem
give an examples of a free-radical polymerization reaction e.g. polymerization of ethylene into polyethylene. indicate
Hexane is used to wash the solid product of a Sn1 carbocation reaction why is ice cold hexane used? and why does it need to be ice cold?
IF a gas is compressed in a cylinder from a volume of 20 L to 2.0 L by a constant pressure of 10 atm. Compute the amount of work done on the system. (1 L*atm = 101.3 J)
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