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A student observed after an experiment that a gas sample of 250-mL has a mass of 0.243 g at a temperature of 28 degree Celsius and a pressure of 760 mm Hg. determine the molar mass of the gas if R=0.0821 L atm / mol K?
Using a gas sample that initially has volume of 24.6 L at a pressure of 1.04 atm then determine what would the pressure be if the volume of this sample gas is decreased to 5.38 Litre also state that which law of gas is used in this process?
A particular reaction has a deltaHo value of -100kj and a delta So value of -203J @ 298k. Assuming that delta Ho and delta So hardly change with temperature, determine the temperature in degrees celcius which the spontaneity of this reaction chang..
Carboxylic acids and phenols can be separated by chemically active extraction if the pH of the aqueous layer is properly chosen. Phenols are sufficiently acidic to be extracted into aqueous sodium hydroxide
The volume of blood in a typical adult is about 4.7 L. How many red blood cells are there in an average adult?
Hydrogenation of carbon double bonds C=C (i.e. adding a hydrogen on each carbon atom and thus reducing the double bond into a single bond: H-C-C-H) is a very common process in organic and polymer chemistry
Cyclopentadiene is unstable because it rapidly undergoes a Diels-Alder reaction with itself. Carefully draw the structure of the product, showing stereochemistry clearly.
Under the same conditions of temperature and pressure, it takes an equal volume of N2 12.00 min to effuse through the barrier. Calculate the molar mass of the gas and suggest what gas it might be
Supposed you have a beaker of water that is being heated on a hot plate. If you are studying the amount of heat that is requred to change the water temperature by a certin amount. What is a reasonable choice for the system and surroundings?
Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 x 10^-9. What is the pH of a 0.025M HONH2 solution
The solubility of a gas in H2O at a temperature of 25 °C and a pressure of 1.2 atm is 0.042 M. What will the solubility of the same gas be in H2O at the same temperature at 3.4 atm.
How the two solutions are properly mixed together? What is the role of the meniscus in this process?
what is the density of the block? How to approach the problem The apparent mass of the object in the fluid, 5.6 , is equal to its mass in air, 50.0 , minus the mass of the displaced fluid
You are designing a drier that must evaporate 200 lb/h of H2O from sludge by using air. Air at 70°F and 50% relative humidity is drawn into the drier and it leaves at 140F and 70% relative humidity. How much volume of dry air needs to be used for ..
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