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Large beds of rocks are used in solar-heated homes to store heat. Assume that the specific heat of rocks is 0.82J/g-K. a. Calculate the quanituty of heat absorbed by 50.0kg of rocks if their temperature increases by 12.0 C. b. What temperature change would these rocks undergo if they emitted 450kj of heat?
A mixture of 70 mole% butane and 30 mole % hyrdrogen is burned with excess air. Fractional conversion of 85% of the butane and 90% of the hydrogen are achieved
Stearic acid is made by hydrolyzing fat from cattle. The fat, tallow, is predominately glycerin tristearate (formula C57 H110 O6 molecular weight 891.4g/mol)
A solution containing the thiourea complex of bismuth (III) has a molar absorptivity of 9.32*10^3 l/mol*cm at a wavelength of 470 nm
The oxygen sample burned in sodium to form sodium oxide, Na2O - write a balanced equation for the reaction.
A solution of 1.138g of naproxen in 25g benzene has an osmotic pressure of 4.00 atm at 20 C. The density of benzene is 0.8787g/mL. Assume the density of the solution equals the density of pure benzene. What is the molar mass of haproxen
construct molecular models of threo- and erythro-2,3-dibromo-3-phenylpropanoic acid and show which diastereomer would be formed by anti addition of bromine to trans-cinnamic acid
Calculate the molarity of your unknown, assuming it is monoprotic acid or monobasic base. Show all calculations for one titration with good precision including units and correct number of significant figures.
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density
what mass of barium is produced when molten BaCl2 is electrolyzed by a current of 3.30 105 A for 7.00 hours?
Assume that the electrode follows the Nernst equation, the temperature is at 25°C, and that the activity coefficient of X is 1.
Ethyl acetate can be prepared from ethanol as the only organic starting material.
Tetrahedral complexes of Co2+ are quite common. Use a d-orbital splitting diagram to rationalize the stability of Co2+ tetrahedral complex ions.
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