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A hot-air balloon is filled with air to a volume of 4.00 x 10^3 m^3 at 745 torr and 21 degrees Celcius. The air in the balloon is then heated to 62 degrees celcius, causing the balloon yo expand to a volume of 4.20 x 10^3 m^3. What is the ratio of the number of moles of air in the heated balloon to the original number of moles of air in the balloon?
Consider two samples of liquid: one mole of water H2O and one mole of ethanol C2H5OH. The density of water is 1.0 g/mL, and the density of ethanol is 0.785 g/mL. Answer each of the following questions by selecting the correct choice.
why is normal phase chromatography ideal for separating the components chlorophyll a b and carotene in a petroleum
write a symbol for each of the following: a)proton b)gamma ray c)positron d)barium-131 e)palladium-103
Sketch the [1-11] direction within the (110) plane relative to an fcc unit cell. Include all atom-center positions within the plane of interest.
Calculate the pH of a 0.40 M H2SO3, solution that has the stepwise dissociation constants Ka1 = 1.5 × 10-2 and Ka2 = 6.3 × 10-8.
How many grams of sodium bicarbonate and sodium carbonate, respectively, are needed to make 3 liters of 0.075 M buffer,
If 25.0 ml of .451 M NaOH solution is titrated with .253 M H2SO4, identify the principal components (ions, molecules) in the flask at the endpoint besides solvent water or indicator.
Given that an atom of a semiconductor has a diameter of 3.12 , what is the maximum number of moles that fit in the channel of a processor chip that is 63.5 long, 84.1 , wide and 465 thick? Assume that the atoms stack in a simple cubic arrangement.
If I want to make the buffer by adding 0.100 M NaOH instead of sodium acetate, how many milliliters of NaOH are needed to reach pH=4.74?
The amount of boiling water required to raise the temperature of 25 kg of water in the bath to body temperature is 4.8 kg. In this process, the heat lost by the boiling water is equal to the heat gained by the room-temperature water.
The hydrogen gas formed in a chemical reaction is collected over water at 30 at a total pressure of 737. What is the partial pressure of the hydrogen gas collected in this way
Provide a detailed mechanism to account for the conversion of D-fructose into two equivalents of pyruvaldehyde. (Hint: glyceraldehyde will be an intermediate.)
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