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What is the pressure in atmospheres in a container of gas connected to a mercury-filled, open-end manometer if the level in the arm connected to the container is 24.6 cm higher than in the arm open
An ordinary 3.0 V flashlight bulb draws roughly 0.25 A of current and converts about 1.0% of the electrical power into light (λ = 550 nm). If the flashlight beam initially has a cross-section
Use the data to determine the heat of vaporization of nitrogen in kJ/mol. Determine the normal boiling point of nitrogen in Kelvin.
You and a friend are having dinner at a restaurant. You order strong, hot tea with lemon, and your friend orders plain hot tea. When your drinks arrive, the waiter apologetically informs you that he h
How many pi bonds are there in a molecule of crotononitrile? How many sigma bonds are there?
An extended source emits 2.00 W cm-2 sr-1 nm-1 at 300 nm. Calculate the spectral radiant power impingent on a 1.00 cm2 receptor that5 is 2.00 M away in W nm-1 and photons s-1 nm-1 if a 1.00 mm diame
The hydrogen in the water comes from the hydrocarbon compound. If the molecule contains only C, H, and O, what is the empirical formula?
A beam of 632.8 nm photons from a He-Ne laser strikes a detector area of 5.0 mm2. The laser has a flux of 3.18 x 1015 photons s-1. a(a) What is the laser radiant power in watts?
Calculate the volume of a sample of carbon monoxide at -21°C and 359 torr if it occupies 3.65 L at 298 K and 758 torr.
A gas made up of homonuclear diatomic molecules escapes through a pinhole .533 times as fast as Ne gas. Write the chemical formula of the gas.
Write the balanced equation for the reaction for Delta H is the lattice energy for potassium bromide
An extended source is spherical in shape with a radius of 2.00 cm and emits 12.57 W from 399.5 to 400.5 nm. Determine the spectral radiant emittance, the spectral radiant intensity, and the spectra
if the reaction between iron III ion and thiocyanate ion yielded an equilibrium concentration of .15M for each of these ions, what is the equilibrium concentration of the red iron III-thiocyanate co
A 5.00 g sample of aluminum pellets (specific heat capacity = 0.89 J/C g) and a 10.00 g sample of iron pellets (specific heat capacity= .45J/C g) are heated to 100.0 C.
Describe the process that will result in the greatest amount of work done by the system with a constant external pressure and calculate w. What is the least amount of work done with no restrictions
How is the solubility of manganese(II) sulfide affected by the addition of aqueous potassium hydroxide to the system?
The pH of the resulting solution is 8.0. Then you add 40 mL of 1.0 M hydrochloric acid (HCl) to the solution. What is the new pH?
What is the molarity of a solution made by dissolving 0.0815 grams of Na2SO4 in enough water to form exactly 750. mL of solution?
The absorbance of the new solution was 0.500. What is the concentration of Cu2+ in the sample? State any assumptions you might make and pay attention to significant figures.
Caffeine is a stimulant found in coffee and tea . A solution of caffeine in chloroform as a solvent has a concentration of 7.90×10-2 . Calculate the percent caffeine by mass.
A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O.
In a controlled greenhouse at 30.0ºC and 1.0 atm, a crop of seedling tomato plants was found to consume 380 L of carbon dioxide gas during photosynthesis.
At room temperature (20), milk turns sour in about 65 hours. In a refrigerator at 3, milk can be stored three times as long before it sours. What is the activation energy of the reaction tht causes
Calculate the energy of the lowest energy photon that B4+ could absorb, if it is in its ground state. In no more than a couple of sentences, explain the circumstances in which some hydrogen-
What is the pressure in millimeters of mercury of 0.0110 of helium gas with a volume of 214 at a temperature of 50