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Calculate the standard enthalpy. of formation of solid Mg(OH)2 using the following thermochemical info: Mg (s) + O2 ---> 2MgO(s) delta H = -1203.6 kj Mg(OH)2 (s) ----> MgO (s) + H2O (l) delta H = 37.1 kj 2H2 (g) + O2 (g) ----> 2H2O(l) delta H = -571.7 kj
calculate the potential of a platinum electrode immersed in a solution that is prepared by mixing 25 ml of 0.0832 M V2(SO4)3
What volume of a 15.0% by mass NaOH solution (density 1.116g/mL), should be used to make 5.3L of an NaOH solution with a pH of 10
What is the mass concentration of oxygen in the mixture? (Note that the vast majority of oxygen is bound to other atoms.) Give answer in g/L, 2 significant digits.
Calculate the standard reaction enthalpy for the following reaction. N2H4(l) + H2(g) -----> 2NH3(g) Given: N2H4(l) + O2(g) -------> N2 (g) + 2H2O(g)
an oxygen-oxygen bond has an enthalpy of 498 kj/mol , and the standard enthalpy of formation of CIO2(g) is DH f=102.5 kj/mol , use Hess's law to calculate the value for the enthalpy of formation of CIO (g)
A second assay was performed by making a derivative, ammonium phospho-molybdate, which has visible absorption peak at ~ 400nm. From the Beer's Law plot, estimate the concentration of the unknown solution
Two substances, A and B, initially at different temperatures, come into contact and reach thermal equilibrium. The mass of substance A is 6.34g and its initial temperature is 21.0?C.
Consider the following equilibrium reaction that has achieved a state of dynamic equilibrium. In a 3.00 L container, the following amounts were determined at 400ºC: 0.0420 mole N2, 0.516 mole H2 and 0.0357 mole NH3. Determine the value of Kc
How many moles of HCL must be added to 1.50L of 1.70M KOH to obtain a pH of 2.00?
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years
THE RATE CONSTANT FOR A CERTAIN REACTION IS K=1.40 * 10^-3 s^-1. if the initial reactant concentration was o.250 M, what will the concentration be after 5.00 minutes
A 46.7 mL sample of a 0.557 M aqueous hydrofluoric acid solution is titrated with a 0.225 M aqueous potassium hydroxide solution. What is the pH after 76.4 mL of base have been added
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