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X rays of wavelength 2.63 Ao were used to analyze acrystal. the angle of first order diffraction (n=1 in the bragg eq)was 15.55 degrees.
The mole fraction of an aqueous solution of titanium(IV) iodite is0.328. Calculate the molarity of the titanium(IV) iodite solution,if the density of the solution is 1.15 g mL-1.
Carbon diselenide (CSe2) is a liquid at roomtemperature. The normal boiling point is 125oC, and themelting point is -45.5oC. Carbon disulfide(CS2) is also a liquid at room temperature with normalboili
A deep-sea diver uses a gas cylinder with a volume of 10.0L and acontent of 51.2 g of O2 and 32.6 g of He. Calculate the partial pressure of each gas and the total pressure if the temperature of the
Draw lewis and line bond structures for formaldimine,CH2NH. How many electrons are shared in thecarbon-nitrogen bond? What is the hybridization of thenitrogine atom?
An electron in a hydrogen atom in the n = 6 energy level emits 109.4 kJ/ mol of energy in a transition to a lower energy level. To what energy level does the electron fall?
A certain reaction has the following general reactionaA=bBAt a particular temperature and [A]0=2.00x10^-2 M,concentration versus time data were collected for this reaction,and a plot of ln[A] versus
Calculate the frequency of the electromagnetic waves produced whenthe electrons in a mole of hydrogen atoms change from the fifth tothe second energy level.
Given the most common mineral in limestone is calcium carbonate, illustrate how thes limestone objects are corroded by sulfuric acid in polluted air.
When 2-methylpropene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?
The radius of gold is 144 pm, and the density is 19.32 g/ml. Does elemental gold have a face-centered cubic structure or a body centered cubic structure? Show all work please.
In normal blood, there are about 5.4 x 109 redblood cells per milliliter. The volume of a red blood cell is about90 x 10-12 cm3, and its density is 1.096g/mL. How many liters of whole blood would b
2 Mg + O2 ------> 2MgOif 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? What is the name and the amount of the r
Determine the speed of an electron being emitted by rubidium (2.16 eV) when light of the following wavelengths is shone on the metal in vacuum (a) 550 nm (b) 450 nm and (c) 350 nm.
2Na + 2H2O -------> 2NaOH + H2if 90.0 grams of sodium is dropped into 80.0 ml of water, how many liters of hydrogen at STP woud be produced? which reactant is in excess and how much of it is lef
The normal boiling point for acetone is 56.5 degrees celsius. At an elevation of 5300 ft the atmospheric pressure is 630 torr. What would be the boiling point of acetone (delta H vap=32 KJ/mol) at
The perimeter, area, and volume of a tetrahedron (the solid whosefaces are 4 equilateral triangles) are respectively: P=6a, A=3 1/2 a2, and V=2 1/2 a3 /12.
Consider the following complex, which has Co(III) in an octahedralgeometry: [Co(en)(dien)Cl]2+ given: en = ethylenediammine = H2NCH2CH2NH2, which can beabbreviated N-N dien = diethylenediammine = H
What are some of the practical applications of complete or incomplete combuston of hydrocarbons? and what kind of things do consumers in industries ensure to make sure tha appliance that burn hydro
You had 58.45 mg NaCl. How many milliliters of H2O are needed tomake a 1.0 M solution of aqueous NaCl? How many milliliters of H2Oneeded to make a 10% solution (by weight) of aqueous NaCl?
An unknown salt is eitherNaCN, NaC2H3O2 , NaF,NaCl, or NaOCl. When 0.100 mol of the salt is dissolved in 1.00 Lof solutions, the pH of hte solution is 8.07. What is the identityof the salt?
Hydrogen and oxygenreact chemically to form water. How much water would be formed if 4.8 grams of hydrogen reacted to 38.4 grams of oxygen?
A sample to be used for medical imaging is labeled with 18F, which has a half life of 110 minutes. What percentage of the original activity in the sample remains after 300 minutes?
You are given a solid that is a mixture of sodium sulfate and potassium sulfate. a o.205g sample of the mixture is dissolved in water. An excess of an aqueous solution of barium chloride is added. t
At 55degee centigrade,A has a vapor pressure of 95 mmHg and B has a vapor pressure of 42 mmHg . A solution is prepared by mixing equal masses of A and B.