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The isothermal compressibility of lead is 2.21E-6 atm-1. Express this value in Pa-1. A cube of lead of side 10 cm at 25C is to be inserted in the keel of an underwater exploration TV camera, and its designer needs to know the stresses in the equipment. Calculate the change of volume of the cube at a depth of 1.000 km (disregarding the effects of temperature). Take the mean density of sea water as 1.03 g/cm3. Given that the expansion coefficient of lead is 8.61E-5 K-1 and that the temperature where the camera operates is -5C, calculate the volume of the block taking the temperature into account too.
a stock solution containing cobalt ions was prepared by dissolving 393 grams of pure cobalt metal in nitric acid and diluting to a final volume of 8.75 L. Determine the concentration of the stock solution.
How many grams of oxygen are collected in a reaction where 231 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr?
The density of lead is 11.3 . The water level in a graduated cylinder initially at 205 rises to 290 after a piece of lead is submerged. What is the mass in grams of the lead?
1.What is the effect of the following on the observed melting point of the compound: a) insoluble purity, such as charcoal; b) incomplete drying of the sample; c) less recrystallization solvent was used than it was needed?
At 25°C, 1.0 g of caffeine is dissolve into 47 ml of water, 18 ml of dichloromethane, into 86 ml of benzene, or into 270 ml of diethyl ether. Which solvent would provide the largest extraction coefficient (KD). Briefly explain.
Propanoic acid has a Ka of 1.4 x 10^5. If we make a solution 0.100 M in propanoic acid, what concentration of sodium propanoate should be added to give a buffer with a pH of 5.0?
A solution of ammonia and water contains 4.20×10^25 water molecules and 6.90×10^24 ammonia molecules. How many total hydrogen atoms are in this solution?
Salicylic Acid and Acetic Anhydride --> Acetylsalicylic Acid and Acetic Acid C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O2 Salicylic Acid - 1.75g 1.6 equivalents of acetic anhydride for every equivalent of salicylic acid.
Describe the technique you would use to determine the density of approximately 5 gram samples of the following at 20 degrees celcius and 1 atmosphere pressure:
How many moles of nitrogen are needed to react with 42 moles of oxygen?
In an airplane, a gas sample occurs at a volume of 1.5 L at 760.0 torr. Suppose, while flying, the airplane loses pressure and the volume of the gas increases to 11.40 L.
If hydrogen gas is collected over water at 20°C and 763 mm Hg, what is the partial pressure of the H2? The vapor pressure of water at 20°C is 17.5 mm Hg.
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