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A 45.5 g sample of copper at 99.8 degrees C is dropped into a beaker containing 152 g of water at 18.5 degrees C. What is the final temperature when thermal equilibrium is reached?
Cs for H2O (l)=4.184
Cs for Cu (s) =0.385 (J/g. degrees C)
calcuate the number of moles of HCI and of NaOH present when mixing 50.0mL
If 352 g of magnesium reacts with excess oxygen to produce 296 g of magnesium oxide, what is the percent yield for the reaction?
A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q.
What is the name of the haemoglobin variant? Would this haemoglobin demonstrate a left or right shift on an oxygen dissociate curve ? Fully justify your answer.
A sealed balloon is filled with 2.20 L helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 190. torr and the temperature is -35°C
Calculate the oxidation number of the chlorine in perchloric acid, HClO4.
If a 2.1 L reaction vessel initially contains 723 torr of cyclopropane at 485 degrees C , how long will it take for the partial pressure of cylclopropane to drop to below 105 torr ?
A photoelectron spectroscopy experiment is conducted in which light with a wavelength of 58.4 nm is directed at a sample of rubidium, resulting in the ejection of the electron
If a reaction mixture contains only N2O and NO2 at partial pressures of 1.0 atm each, the reaction will be spontaneous until some NO forms in the mixture.
The density of titanium metal is 4.51g/cm3 at 25 degrees celsius. What mass of titanium displaces 125.0mL of water at 25 degrees celsius.
Estimate how long it will take for the bleach molecules to diffuse through the extent of the room, assuming that the bleach bottle is in the center of the room, and the room is perfectly square, and is a 10 foot x 10 foot room.
a 27.7 ml sample of CO2 was collected over water at 25.0 degrees celcius and 1.00 atm.(the vapor pressure of water at 25.0 degrees celcius is 23.8 torr) What will the volume be at the same temperature and pressure after removing the water vapor?
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