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Consider the combustion of liquid ethanol. a) Write the complete balanced chemical equation for the reaction, including state subscripts. b) Calculate the change in enthalpy per mole of ethanol. The data table is on the back. c) A 1.25 g sample of this liquid was burned in a bomb calorimeter. How many kJ of heat was released in the reaction?
An oxidation-reduction happens in any electrochemical cell; voltaic or electrolytic. (look these terms up in your general chemistry text if you don't remember them.)
A student starts with 55.0701 grams of iron (lll) nitrate nonahydrate, Fe(NO3)^3 * 9 H20 and dissolves this in 250 mL of water. This solution is diluted to the mark on a 500 mL volumetric flask.
Na3P + 3H2O ---> PH3 + 3NaOH. What is the theoretical yield of PH3 when 150 grams of Na3P is mixed with 250 grams of H2O? If the actual yield is 30 grams, what is the % yield?
In proteins, the amino acid histidine (His) plays an important role in many biological reactions. The pKa for the protonation of His to form HisH
What is the pH of a solution made by mixing 25.00mL of 0.200M CH3COOH with 10.00mL of 0.200M NaOH? Ka of acetic acid is 1.8 x 10^-5.
Solve an equilibrium problem (using an ICE table) to calculate the pH 1)a solution that is 0.13M in NH3 and 0.15M in NH4Cl 2) 185.0 mL of 0.12M C2H5NH2 with 265 mL of 0.20M C2H5NH3Cl
If the equilibrium constant for a one electron redox reaction at 298k is 8.7*10^4, calculate the corresponding change in G and Ecell
A 100 mL sample of an aqueous solution at 25 C contains 20.4 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 5.88 torr, what is the molar mass of the unknown compound
The specific heat capacity of silver is 0.235 J/g K. Its melting point is 962 C and its enthalpy of fusion is 11.3 kJ/mol. What quantity of heat in joules is required to change 5.00 g of silver from a solid at 25 C to a liquid at 962 C?
The solubility of calcium carbonate (CaCO3) is 9.3 multiplied by 10-3 g/L. Calculate the solubility product of this compound.
A second sample of this acid weighing 3.00 grams is added to the tirated sample and the pH is 6.60. Calcualte the molar mass of the unknown acid and determine the value of Ka for this acid.
Estimate the free energy change (?Grxn) for the following reaction at 298 K, if each gaseous substance is present at p = 0.30 atm. 2H2(g) + O2(g) ? 2H2O(l)
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