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The enthalpy for oxidation of diamond by oxygen to carbon dioxide is -395.4 kJ/mol but the enthalpy for oxidation of graphite to carbon dioxide is -393.4 kJ/mol. Find the enthalpy of reaction for gr
A student analyzed a 0.2078g sample containing aspirin using 0.1014M NaOH. The student obtained a % purity of 76.1%. Calculate the volume of NaOH that is required in order to reach the end point o
The weathering of pyrite (FeS2) in coal mines and in metal sulfide ore deposits can be represented by the following reaction
Use the following data on oxygen solubility to calculate the enthalpy of reaction for oxygen dissolving into water.
Calculate the number of moles of CO 2 Calculate the number of moles of CO 2
Light impinges on a 1485 line per mm diffraction grating at an angle of incidence of 39.5 degrees. What wavelength, in nm, will be reflected in the first order at an angle of 14 degrees on the other
What is the osmotic pressure of a solution made from dissolving 50.0g of glucose rm C6H12 O6 in 250mL of water at 36.0 C
What would ?U and w be if the expansion connects the same initial and final states as in (a) but is done by having the perfect gas expand into a vacuum.
When iron chloride FeCl3 is dissolved in water the solution becomes acidic. The preparation of the Fe(NO3)3 solution and the KSCN solution used 0.5 M HNO3 as the solvent instead of water. Explain wh
Determine the fraction of piperazine in each of its three forms (H2A, HA^-, A^2-) at PH 6.56
Given that the partial pressure is 7.0x10^-4 atm, what is the pH of water at equilibrium with the atmosphere
What mass of melamine, C3N3(NH2)3 will be obtained from 162.0 kg of urea, Co(NH2)2 if the yield overall reaction is 80%
The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1. What fraction of the tritium initially in a sample is still present 30 years later?
Identify the set of stoichiometric coefficients that balance the reaction equation for the combustion of octane. C8H18+O2--->CO2+H2O
Nitrogen and oxygen combine to form several different nitrogen oxides. In one case 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of
What mass of carbon dioxide is produced from the complete combustion of 5.80×10^3 g of methane. Express your answer with the appropriate units.
For each of the elements below, there are only two naturally occurring isotopes. Using information in the periodic table, identify the pair in which the lighter isotope is the more abundant one.
A fuel cell works on the same principle as a battery but is continually fed with fuel. In one fuel cell, methanol enters on one side of the unit, and air enters on the other side both circulate past
the summit of Mt. Humphreys, the highest point in Arizona, is 12,600 ft. How many meters is this
a hypothetical element has two stable isotopes one has a mass of 106.9051 amu with an abundance of 48.183% the other isotope has a mass of 108.9048 amu with an abundance of 51.825% what is the avera
What mass of platinum will be formed when 12.5 A are passed through molten PtCl2 for 30.0 minutes
Two types of electrochemical cells which are based on thermodynamic principles can be described. Which of the following statements about these cells is correct
Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine.