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Pure O2 diffuses through an aperture in 224 seconds whereas a mixture of O2 and another gas containing 80% O2(by wt) diffuses from the same in 234 seconds. Explain what is the molecular weight of the gas?
With the pure solvent in the light path, the meter reading is 78; with a 0.1 M solution of a solute in the same solvent, the meter reading is 55. The light path is 0.5 cm. Calculate the absorbance, the transmittance, and the molar absorption coeff..
Water in an enclosed vessel at 17°C contains a concentration of dissolved oxygen of 6 mg/L. At equilibrium, determine the concentration of oxygen in the space above the water in molal fraction. and the total pressure in the vessel. Henry's law con..
If 28 mL of a .537 M NaOH solution is needed to neturalize 20 mL of a carbonic acid (H2CO3) solution, what is the molarity of the carbonic acid? (Write a balanced chemical reaction first.)
a typical aspirin tablet contains 324 mg of aspirin (acetylsalicylic acid, C9H8O4, Ka = 3.0×10-4). Imagine you dissolve two aspirin tablets in a 275 mL glass of water. Calculate the solution's pH.
Outline the phase diagram of the system nh3/n2h4 given that the two substances don't form a compound with each other, that nh3 freezes at -78 C and n2h4 freezes at +2 C and that a eutectic is formed while the mole fraction of n2h4 is 0.07 and that..
The complete combustion of pentane releases 243 kj on the basis of this information calculate the value of delta H for the complete combustion of one mole of pentane
a solution of baoh2 is standardized with potassium acid phthalate abbreviated khp khc8h8o4 m 204. if 1.530 g of khp is
Nitrogen and hydrogen gases are combined at high temperatures and pressures to produce ammonia, NH3. If 104.7 g of N2 are reacted with excess H2, how many moles of NH3 will be formed?
Calculate the values of k and kc for the reaction 3N2(g)+H2(g) 2NH3(g) at 25 c and 100c.
Draw the Newman projection for the most stable conformation of (2R,3S)-2,3-dichloropentane.
Carbon-11 radioactively decays by positron emission with a half-life of 20.4 minutes. If a dosage of carbon-11 is administered to a patient for a PET scan, what percentage of carbon-11 will remain in the patient's system after 61.2 min
describe the reactant and products of the chemical reaction. Qas the reactant (potato chip) completely consumed? What evidence supports your answer?
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