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A gaseous mixture consists of 80.0 mole percent N2 and 20.0 mole percent 02. Suppose water is saturated with the gas mixture at 25 c and 1 atm total pressure, and then the gas is expelled from the water by heating. What is the composition in mole fractions of the gas mixture that is expelled? The solubilities of N2 and O2 at 25 c and 1 atm are .0175 g/LH2O and .0393 g/LH2O, respectively.
A buffer solution contains 0.1 M CH3COOH and 0.1 M sodium acetate (that is, it has 0.2 M total buffering components of acetic acid + acetate). Calculate the pH after addition of 4 mL of 0.025 M HCl to 10 mL of the buffer. The pKa for acetic acid i..
A Nylon 4-6 polymer with an average molecular weight of 10,000g/mol is reffered to as Nylon 4-6 (10,000). If one repeat unit of Nylon 4-6(10,000). If one repeat unit of Nylon 4-6 has a molecular weight of 198.26 g/mol, how many repeat units are pr..
Helium gas, at constant pressure of 1.6 atm, expands in volume from 25.7 L to 86.3 L. The temperature is held at 357 K. Calculate the work done by the gas(in joules).
Silver metal has a density of 10.5 g/cm3. how many silver atoms are in a cube that measures 5.00cm on each side
Vitamin B12, also known as cobalamin, has the molecular formula C63H88N14PO14Co. What mass of CO2 and H20 would be produced during the combustion analysis
Nitrous oxide gas is used by some denatl practitioners as a anesthetic. Nitrous oxide can be produced in small quantities in the laboratory by cardful heating of ammonium nitrate. Write the unbalanced chemical equation for the reaction.
napthalene lowered the freezing point of the solvent by 0.780K. Calculate the molar mass of the compound. [Kf of napthalene= 6.94 K*kg/mol]
The activation energy of a certain reaction is 46.7 kJ/mol. At 20 C, the rate constant is s^-1. At what temperature would this reaction go twice as fast
Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.022 moles of sulfuric acid is mixed with water to make 607 mililiter of solution, what is the molarity of H+.
At this temperature iron is in the BCC form and will dissolve (interstitial) carbon up to about 0.001 wt%. If the criterion is that the carbon concentration equals 0.0002 wt% carbon at a depth of 100 microns, how long must the exposure be
Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if there daily consumption of water per person is 170 gallons. (Sodium fluoride is 45.0 percent fluorine by Mass. 1 gallon=3.79 liters, density of w..
draw electron flow arrows and complete the lewis structures for the reaction that occurs between an alkene and hydrogen
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