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A voltaic cell is constructed that uses the following reaction and operates at 298 K. Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a) What is the emf of this cell under standard conditions? (b) What is the emf of this cell when [Ni2+] = 3.55 M and [Zn2+] = 0.151 M? V (c) What is the emf of the cell when [Ni2+] = 0.200 M and [Zn2+] = 0.957 M?
given that the molar enthalpy of vaporization delta h for H2O(l) is 44kj at 298k, what is the standerd enthalpy change for the reaction 2H20(G)+ O2(g)---->2H2O(G)?
Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of the compound the ions produce. N and Mg
What is the pH of a phosphate buffer when [H2PO4-] = 40 mM and [HPO42-] = 30 mM?
Mercury, with a freezing point of -38.8 degrees Celsius, is the only metal that is liquid at room temperature. How much heat energy must be removed from 1.00 mL of mercury at 23.0 degrees Celsius to produce solid mercury?
Assume the Pacific Ocean has a surface area of 1.7 x 108 km2 and an average depth of 3900 m. Calculate the volume of water in the ocean in liters
If the partial pressure of helium is the same as the partial pressure of oxygen, what do you know about the number of helium atoms compared to the number of oxygen molecules? explain.
why is it easier to analyze a mixture of atomic species by absorption spectroscopy than it is to analyze a mixture of molecular species?
Calculate the concentrations of all species in a 0.840 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid
A biochemist wants to utilize the following oligopeptide for biochemical assays. Estimate the number of charges on this peptide at different pH conditions by considering the charge states of amino acid residues at pH 2, pH 7.4 and pH 10.
Draw trans-1-methyl-4-isopropylcyclohexane oin its two chair flipped forms. Indicate which of chair conformations
2C8H18(l) + 25O2(g) => 16CO2(g) + 18H2O(l) ?H = -11,200. kJ Standard enthalpies of formation, ?Hf: CO2(g), -393.5 kJ/mol; H2O(l), -285.8 kJ/mol Use the above data to calculate the standard enthalpy of formation of octane, C8H18(l).
What mole ratio of sodium acetate to acetic acid, pKa = 4.74, should be used in preparing a buffer solution having a pH of 4.35
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