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Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. How many ozone molecules are present in 1.00 L of air under the stratospheric ozone conditions of 227 K temperature and 1.89 * 10^-3 atm pressure
how do you calcalculate a cube of an unknown metal measures 1.61mm on one side. the mass of the cube is 36mg. which of the following is most likely the unknown metal rhodium, cooper, niobium, vanadium, or zirconium and explain why please.
To resolve an object in an electron microscope the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 2.60 nm in diameter
A box of volume 20.0 L contains 1.50 moles of an ideal gas. This gas initially consists of a single molecular species, X (molar mass of 42.0 g/mol), at a temperature of 25.0 °C.
Raw milk sours in 4.0 hours at 28 degrees celcius but takes 48 hours to sour in a refrigerator at 5 degrees celcius. Calculate the activation energy for the souring of milk?
A solid sample containing some Fe^2+ ion weighs 1.062 g. It requires 24.12 mL 0.01562 m KNno4 to titrate Fe^2+ in the dissolved sample to a pink end point
How many grams of are CaH2 needed to generate 147L of H2 gas if the pressure of H2 is 827 torr at 20 C?
A nitric acid solution containing 71% HNO3 (by mass) has a density of 1.42g/mL. how many moles of HNO3 are present in 1.00L of this solution.
The electron transport chain complexes that have higher electron affinities steal electrons from those with lower electron affinities.
Formic acid (Ka= 1.7 x 10^-4) and sodium formate were used to prepare a buffer solution of pH 4.31. The concentration of the undissociated formic acid in this buffer solution was 0.80 mol/L
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 72% of the Mg2 be precipitated as the hydroxide salt? [Ksp for Mg(OH)2 = 8.9 multiplied by 10-12.]
Determine which of them exhibit resonance. (In other words, which of the following molecules exhibit resonance? Note: there is more than one answer and you must choose all of the molecules in the list that exhibit resonance.)
A manometer shows a mercury level of 225 mm Hg on the closed end of the tube and 108 mm Hg on the open end. If the atmospheric pressure is 760 torr,
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