Saturday
September 20, 2014

Posts by Elleni


Total # Posts: 9

College Chemistry
The equilibrium constant for the conversion of cis-stilbene to trans-stilbene is Kc = 24.0 at 200 C. If cis-stilbene is placed in an empty container at an initial concentration of 0.850 mol/L. What is the final concentration of trans-stilbene in the container at equilbrium? A ...
October 27, 2010

College Chemistry
The rate constant for decomposition of compound X was determined to be 1.0x10^-4 s-1 at 298 K and 1.0x10^-2 at 365 K. The activation energy for reaction is: I dont know if this is correct 8.314 x 10^-3 x 298x365 divided by 365 - 298 x In 1.0 x10^-2 divided by 1.0-4. This gives...
October 27, 2010

College Chemistry
Calculate the cell potential for the following Galvanic cell: Co(s) Co2+ (0.15 mol L-1, ag)Fe 2+ (0.68 mol L-1, ag)Fe(s) Given that the standard reduction potential Eo for Co2+ is -0.28 V and Eo for Fe2+ is -0.44 V. Anwer is -0.14 V The left side of the above equaton is the ...
October 27, 2010

College Chemistry
A Galvanic cell consists of Mg electrode in a 1.0 mol L -1 Mg(NO3)2 solution and a Ag electrode in a 1.0 mol L-1 AgNO3 solution. Calculate standard emf for the spontaneous reaction of this electrochemical cell at 25 C, given that the standard reduction potential Eo for Ag+ is...
October 27, 2010

College Chemistry
What is pH of the buffer 0.1 mol L-1 Na2HPO4/0.15 mol L-1 KH2PO4? (Given Ka(H2PO4-)=6.2x10 power-8). Sorry if the power is confusing. My computer does not have the symbol. Thanks
October 22, 2010

College Chemistry
What is pH of an aqueous solution formed by adding 20 mL of 0.1 mol L-1 NaOH to 30 mL of 0.2 mol L-1 HCI? Please show steps and maths. Is there a unit conversion if so how is this done. Thank you
October 22, 2010

College Chemistry
Calculate pH of a 1.0 mol L -1 boric acid solution. (Ka(H3BO3) = 5.8 x 10 power -10 Please solve this problem. My computer does not have the power symbol. Can you please show maths and steps. Is mollar mass required of the above. Is -log and constant above used. Thanks
October 22, 2010

College Chemisty
The pH of water collected in a stormwater run-off downstream from a Union Carbide chemical factory is 4.82. Calculate the H+ ion concentration of rainwater. The problem may start with: pH= -log H+ = 4.82. The answer is 1.5x10 power -5. Again, Can you please show steps for maths.
October 22, 2010

College Chemistry
A student weighs out 0.568 g of KHP (molar mass=204g/mol) and titrates to the equivalence point with (36.78 cm cubed which is 3) of a stock NaOH solution. What is concentration of stock NaOH solution? KHP is an acid with one acidic proton. The word cubed is in word form ...
October 22, 2010

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