Consider the combustion of butane gas: C_4H_10(g) +13/2 O_2(g) rightarrow 4CO_2(

Question

Consider the combustion of butane gas: C_4H_10(g) +13/2 O_2(g) rightarrow 4CO_2(g) + 5H_2O(g) Predict the signs of Delta S degree and Delta H degree Delta S degree Calculate Delta G degree. Use the data in a table of standard thermodynamic values to determine the K_sp of CaF_2. (Enter your answer in scientific notation.) Standard Thermodynamic Values at 298 K A BaSO_4 slurry is ingested before the gastrointestinal tract is x-rayed because it is 2+ opaque to x-rays and defines the contours of the tract. Ba^2+ ion is toxic, but the compound is nearly insoluble. If Delta G degree at 37 degree C (body temperature) is 59.1 kJ/mol for the process BaSO_4(s) Ba^2+ (aq) + SO_4^2-(aq) what is the [Ba^2+] in the intestinal tract? (Assume that the only source of SO_4^2- is the ingested slum .) (Enter your answer in scientific notation.)

Explanation / Answer

This is combustion reaction, so delta H is always negative.

Here number of moles of gases in products is greater than reactants. So, delta S is positive.

Delta G = Delta G of products - delta G of reactants.

= ( 4 x -394.4 + 5 x -228.60 ) - ( 1 x -16.7 + 13/2 x 0)

= -2703.9 kJ

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