In a generic chemical reaction involving reactants A and B and products C and D,

Question

In a generic chemical reaction involving reactants A and B and products C and D, aA + 6B rightarrow cC + dD, the standard enthalpy Delta of the reaction is given by Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants: where m and n represent the appropriate stoichiometric coefficients for each substance. What is Delta for the following chemical reaction? CO2(g) + 2KOH(s) rightarrow H2O(g) + K2CO3(s) You can use the following table of standard heats of formation (Delta ) to calculate the enthalpy of the given reaction. Express the standard enthalpy of reaction to three significant figures and include the appropriate units. Assume for the moment that air consists of 80.00% nitrogen (N2) and 20.00% oxygen (O2) by volume. Use these figures and typical values for temperature and pressure (1.000atm and 25.00 degree C) to calculate the density of air in g/L.

Explanation / Answer

There are multiple questions here . i am allowed to answer only 1 at a time. I will answer 1st question for you.Please ask other as different question.

1.
CO2 (g) + 2KOH (s) ---> H2O(g) + K2CO3(s)
delta Horxn = delta Hf(K2CO3(s)) + delta Hf(H2O(g)) - delta Hf(CO2(g)) - 2*delta Hf(KOH(s))
                          = (-1150) + (-242.8) - (-393.5) - 2* (-424.7)
                          = -150 KJ

Answer: -150 KJ

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