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When X rays of wavelength 0.096 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2°. What is the distance between the layers of atoms responsible for the diffraction?
calculate the total amount of heat energy that must be removed to convert 34.0g of steam to water at 25 Celsius
A 98 L sample of dry air cools from 138°C to -30.°C while the pressure is maintained at 2.85 atm. What is the final volume?
Arrange the four compounds below in order of increasing volatility.
How many grams of calcium chloride should be formed from the reactions of hydrochloric acid and calcium hydroxide? If the reaction in 2.4 only produces 3.0 g calcium chloride, calculate the percentage yield of calcium chloride.
Radio waves are very low energy forms of electrmagnetic radiation. What is the energy of a mole of radio wave photons with a
1.50 g of nh3 react with 2.75g of o2 which is the limiting reactant? How many grams of excess remain after the limiting reactant is completely consumed?
What is the composition in mole fractions of a solution of benzene and toluene that has a vapor pressure of 35 torr at 20 °C? Assume the mixture forms an ideal solution.
What biochemical changes are required to convert tyrosine to (a) norepinephrine and (b) epinephrine? and 3- Some bacterial signaling systems involve kinases that transfer a phosphoryl group to a His side chain. Draw the phospho-His side chain.
What is the M concentration in octanol? (b) pH= 8.00 what is the M concentration in water? what is the M concentration in octanol?
P4(s) + F2(g)-> PF3(g) What mass of F2 is needed to produce 187 g of PF3 if the reaction has a 80.1% yield?
If you dissolve 4 aspirin tablets in a 340mL glass of water, what is the pH of the solution and the percent dissociation?
Consider the following equation: CO + 2 H2 → CH3OH ?H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2.
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