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A solution contains 0.115 mol H2O and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30 degrees C is 25.7 torr. The vapor pressure of pure water at 30 degrees C is 31.8 torr. Calculate the number of moles of sodium chloride in the solution.
an ideal gas at a given state expands to a fixed volume by two types of processes i isobaric ii isothermal. for which
Fluorine-18 undergoes positron emission with a half-life of 1.10 x 102 minutes. If a patient is given a 248 mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83 mg
Rank the bonds of CaBr2, CH4, and Na3N, in order of decreasing ionic character. Where do we always find compounds containing metals, in this ranking order?
Methylated lidocaine, Lidocaine is thought to bind to receptors in its methylated form. Identify in writting the atoms or groups in the compound that could be involved in its binding to a receptor via- hydrogen bonding an ionic interaction
An aqueous solution of fotmic acid can be used to promote a ring-closing reaction
Calculate the reversible work required to transport 1mol of K+ from a region where CK+=5.25 mM to a region where CK+=35.5 mM if the potential change accompanying this movement is ?f = 0.055 V. Assume T = 298 K.
If the pressure exerted on a 375 ml sampe of Hydrogen gas at a constant temperature is decreased from 1.75 atm to 1.00 atm, what will the final volume of the sample be
find the total heat released by the reaction of 100.0 mL of 0.8500M NaOH and 100.0 mL of 0.8404M acetic acid.
Determine the second order rate constant from the initial concentration and half life and what is the second order rate constant?
Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the [OH-] in a 0.456 M solution of oxalic acid (H2C2O4). Use E notation and 3 significant figures.
Why are we being so careful to eliminate moisture from the reaction vessel, solvent, etc? What is the reaction that will occur if water is present?
An unknown compound has the formula XF5. This compound is 42.81% fluorine by mass. Identify the element X, draw a 3-dimensional picture of XF5, and write the complete electron configuration of this molecule.
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