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Evaporating sweat cools the body because evaporation is endothermic and absorbs 2.44 per gram of water evaporated. Estimate the mass of water that must evaporate from the skin to cool a body by 0.30, if the mass of the body is 94 and its heat capacity is 4.0 . (Assume that the heat transfer is 100 efficient.)
What is the molar concentration of sodium hydroxide solution if a titration involved 0.0058 mole NaOH and 31.87 ml of sodium hydroxide.
Unfold the enzyme with urea and 2-mercaptoethanol. Then incubate and crystallize it in the presence of the substrate followed by X-ray crystallography.
In the equation HSO4- + H2O SO4-2 + H3O+, if the Ka is 1.5 x 10 ^-2 and HSO4- = 1.0 M at equilibrium, what is the pH of this solution?
calculate the pH of 50 ml of .15 M HCHO2 with 75 mL of .13 M NaCHO2
If a total of 13.5 mol NaHCO3 and 4.5 mol of C6H8O7 react, how many moles of COs and NA3C6H5O7 will be produced? 3NaHCO3(aq) + C6H8O7(aq) -> 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)
Chemical-plant equipment costs rarely vary in proportion to size. In the simplest case, cost C varies with size S according to the allometric equation 18 Chemical Engineering Thermodynamics C = ?S?
important to dry the hexane extract phase containing the yellow and green pigment prior to performing column chromatography.
Standardization of Na2S2O3, Added 0.12 g KIO3 and dissolved in 75 mL of distilled water. Added .20 g of KI to solution, then added 10 mL of 1M HCl and immediately titrated with thiosulfate solution (made by weighed 25 g of Na2S2O3-5H20
A solution is made by dissolving 0.100 mols of NaOCl in 100.0 mL of water. The Ka of hypochlorous acid (HClO) is 3.0*10^-8 at 25.0 degrees C.
A 74.0-mL sample of 0.13 M HNO2 (Ka = 4.0 × 10-4) is titrated with 0.14 M NaOH. What is the pH after 25.8 mL of NaOH has been added?
At what pH will a solution 0.15 M Cu2+ begin to precipitate as Cu(OH)2? The Ksp for Cu(OH)2 is 1.6 × 10-19.
body scanners used in hospitals operate with 400 radiofrequency energy.How much energy does this correspond to in kilojoules per mole?
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