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Isooctane is a good model compound for gasoline. When 1.14 g of isooctane (C8H18, molar mass = 114 g/mol) reacted with excess oxygen in a constant volume calorimeter, the temperature of the calorimeter increased by 5.83°C. The calorimeter consisted of two components: a steel vessel with a heat capacity of 1.00 kJ/°C and 2.00 L of water surrounding it. The density and specific heat capacity of water are 1.00 g/mL and 4.184 J/(g ⋅ °C), respectively. Use these data to determine the molar enthalpy of combustion of isooctane.
For 2.25 moles of an ideal gas, Pext=P=200x10^3 Pa. The temperature is changed from 122 C to 28.5C and Cv=3R/2. Calculate the q, w, delta U and delta H for an isochloric process.
A compound A has prominent infrared absorptions at 1050, 1786, and 1852 cm-1 and shows a single absorption in the proton NMR spectrum at ? 3.00. When heated gently with methanol, compound B, C5H8O4, is obtained.
If 5.28 x 10^3 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield?
Compute the pH of a buffer solution prepared by dissolving 4.2 g of NaHCO3 and 5.3 g of Na2CO3 in 0.20 L of water. Explain will the pH of the solution change if the volume is increased by a factor of 10? Explain.
A 1.0 ounce piece of chocolate contains 15mg of caffeine, and a 6.0 ounce cup of regular coffee contains 105mg of caffeine. How much chocolate would you have to consume to get as much caffeine as you would from 2.0 cups of coffee.
Excessive quantities of wash water are added to the CaC2O4. H2O precipitate. Will the mass of the CaC2O4. H2O be reported too high, too low, or remain unaffected? Explain
a gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures 257
A saturated solution of magnesium hydroxide in equilibrium with undissolved solid is prepared at 25C. The pH of the solution is 11.03. Calculate the value of the Ksp
Prepare a second chromatogram like that in Part A using the 6 M&M solutions. The dye solutions prepared with the M&M candies are not as concentrated as the solutions of the standard dyes.
The difference in electronegativity between adjacent atoms participating in a covalent bond drives the formation of a polar molecule
Develop and showcase your technical writing skills. Demonstrate quantitative and analytical skills as they pertain to the science of chemistry and it's impact on your daily life. Learn how to research scientific topics
Question- An excited H atom with the electron in energy level 6 emits a photon of wavelength 410nm. what energy level does the electron drop to.
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