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Ascorbic acid (vitamin C, C6H8O6)is a water-soluble vitamin. A solution containing 81.0g of ascorbicacid dissolved in 230g of water has a density of 1.22g/mL at55oC. What is the mass percentage, th
Two point charges, 5 μC and -8 μC are 1.2 m apart. Where should a third charge, equal to 5 μC, be placed to make the electric field at the midpoint between the first two charges equal to ze
At 20oC the vapor pressure of benzene(C6H6) is 75 torr, and that of toluene(C7H8) is 22 torr. Assume that benzene andtoluene form an ideal solution.
Find the electric field at the center of a square produced by four equal 2 μC charges located at its corners. Also for the same situation, find the electric field at the center if two of the neig
The heat of combustion of methane, a component of natural gas, is212 kcal/mol. That of propane, a component of LP gas, is530kcal/mol. On a gram-for-gram basis, which hydrocarbon is the better sourc
Alan leaves Los Angeles at 8:00 AM to drive to San Fransisco, 400 mi away. He travels at a steady 50mph. Beth leaves Los Angeles at 9:00AM and drives a steady 60mph. Who gets to San Fransisco first?
Acetylene has a pka of25. Calculate the Ka. The pka of phenol is 9.9. Which isthestronger acid: acetylene or phenol? Calculate the free energy ofionization of acetylene and phenol.
A gas has a volume of 450.0 mL. If the temperature is held constant, what volume would the gas occupy if the pressure were doubled? Reduced by one-fourth?
what is the total energy stored in the capacitor? Find this in two ways: directly from the given information and also from the result of part (a)
If we model the Earth-cloud system as a huge capacitor, what are the capacitance of the Earth-cloud system, the charge stored in the "capacitor", and the energy stored in the "capacitor"?
If your pipet was calibrated incorrectly so it transferred too muchsolution, the density you calculated for the liquid would tend tobe [larger,smaller] than the correct value. Why?
Find the position and velocity of a particle at t = 2.02 s if the particle is initially moving east at a speed of 21.6 m/s and experiences an acceleration of magnitude 3.96 m/s2, directed west.
You and another student were each given an unknown compound. Both samples contained colorless material. You each used the same brand of commercially prepared TLC plate and developed the plates using
A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is .95, is observed. Does this indicate that the unknown material i
A charge Q is transferred from an initially uncharged plastic ball to an identical ball 17 cm away. The force of attraction is then 68nM . How many electrons were transferred from one ball to the ot
Find the location of the place(s) along the x axis where the electric field due to these two charges is zero. (Enter the locations in order from -x to +x. If there is only one location, enter 0 in t
A small drain plug with a cross-sectional area of 4.0 x 10^-5 m^2 is located 5.0 m from the bottom of the tank. The plug breaks loose from the tank, and water flows from the drain. (a) Calculate th
A 100.-L flask contains a mixture of methane, CH4, andargon at 25 degrees celcius. The mass of argon present is 228g and the mole fraction of methane in the mixture is 0.650. Calculate the total ki
Two gas cylinders are identical. One contains the monatomic gas neon (Ne), and the other contains an equal mass of the monatomic gas radon (Rn).
A longitudinal standing wave is established in a tube open at one end only. In air, the fundamental frequency is 110 Hz. What is the frequency of the 3rd harmonic when helium fills the tube? Take th
A charge of -5.0 mC is rigidly held on the x-axis at x = 4.3 m. Find the work (in Joules) done bringing a -10.0 mC particle in from infinity to x = 4.6 m. Please show your work.
A piece of metal weighing 5.10 grams at a temperature of48.6oC was placed in a calorimeter into 20.00 mL ofwater at 22.1oC, and the final equilibrium temperature was found to be 29.2oC. What is the
If an electron moved from a location with 10.0V potential to a location with a 25.0V potential, would its potential energy increase or decrease? Explain.
A solution contains 50.0g of heptane (C7H16)and 50.0g of octane (C8H18) at 25 degrees C.The vapor pressures of pure heptane and pure octane at 25 degrees Care 45.8 torr and 10.9 torr.
A lever is used to lift a heavy load. When a 40 N force pushes one end of the lever down 2.2 m, the load rises 0.8 m. Calculate the weight of the load.