# Chemistry

posted by .

Calculate the free energy (ΔG˚) of reaction (kJ) for the equation as written at 298 K (Dependence of temperature on enthalpy can be disregard). If the answer is negative, enter the sign and then the magnitude. Express your answer to three significant figures.

CaO(s) + H2O(l) → Ca(OH)2(s)

I know this part (Hess's Law stuff):
FYI the numbers were given enthalpy values.

DeltaG=DeltaH-TDeltaS
DeltaH=-986.1-[-635.1-285.83]=-65.17
DeltaS=83.4-[39.7+69.91]=-26.17
Then you plug it in the equation and solve for DeltaG, but when they say to disregard the temperature, does that mean I don't plug in the 298 to T or do I?

• Chemistry -

If the delta G" is delta Go, I think you are supposed to look up the value of delta Go in a set of tables. DGo for the rxn = [DGo products] -[DGo reactants]

• Chemistry -

Hmmm...well the problem gives us a table of values for DeltaH and DeltaS for the compounds, but purposely left the DeltaG for the compounds blank, so I'm assuming they want you to use what values they give you to solve for it.

## Similar Questions

1. ### Chemistry- HWK CHECK

1. A solution in which no more solid can be dissoved is referred to as ____. Answer: saturated 2.At constant pressure, heat can be referred to as (entropy, enthalpy, or free energy). Answer: enthalpy The measure of disorder or randomness …
2. ### chemistry

Suppose the ΔGof, ΔHof, and ΔSo are available and valid at 298 K. Which equation(s) could be used to calculate the change in Gibbs Energy if all product and reactant concentrations (pressures) are 1 M (1 atm) and the …
3. ### Chemistry

Calculate the enthalpy (ΔHo) of reaction (kJ) for the equation as written. If the answer is negative, enter the sign and then the magnitude. 2 HCOOH(l) + O2(g) → 2 CO2(g) + 2 H2O(l) . ΔHof (kJ/mol) HCOOH(l) -409 O2(g) …
4. ### Chemistry

Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is: C2H2(g) + 2H2(g) === C2H6(g) Given the following, what is the Kp for the reaction?
5. ### Chemistry

I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it …
6. ### Chemistry

I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it …
7. ### Chemistry

Calculate the standard entropy, ΔS°rxn, of the following reaction at 25.0 °C using the data in this table. The standard enthalpy of the reaction, ΔH°rxn, is –44.2 kJ·mol–1. C2H4(G)+H20 ---> C5H5OH ΔS°rxn= …
8. ### Chemistry

The ΔH of the reaction below is -575.13 kJ. Is this reaction spontaneous?
9. ### Chemistry

At room temperature (25 °C), the gas ClNO is impure because it decomposes slightly according to the equation 2ClNO(g) Cl2(g) + 2NO(g) The extent of decomposition is about 4%. Based upon this, what is the approximate value of ΔG°298 …
10. ### chem 100

For the reaction CH3OH(g)←→CO(g) + 2H2(g), a. Determine ΔHo and ΔSo for the reaction at 298K b. Determine the entropy change for the surroundings assuming that they are at 298 K. What does this result tell you?

More Similar Questions