# Chemistry

Which of the following reactions are spontaneous (favorable)?
A] 2Mg(s) + O2(g) -> 2MgO(s) Delta G = -1137 kJ/mol ..
B] NH3(g) + HCl(g) -> NH4Cl(s) Delta G = -91.1 kJ/mol ...
C] AgCl(s) -> Ag+(aq) + Cl-(aq) Delta G = 55.6 kJ/mol ..
D] 2H2(g) + O2(g) -> 2H2O(g) Delta G = 456 kJ/mol
E] C(s) + H2O(l) -> CO(g) + H2(g) Delta G = 90.8 kJ/mol
F] CH4(g) + 2O2 -> CO2(g) + 2H2O(l) Delta G = -820 kJ/mol

I said that reaction A, B, and F were spontaneous because my book said spontaneity occurs when Delta G < 0 ... but theres also an example of a dissociation equation being spontaneous.. does that mean that reaction C is also spontaneous?

1. 👍 2
2. 👎 0
3. 👁 3,998
1. No. dG for C is >0; therefore, it is not spontaneous. What dissociation equation is listed as spontaneous.

1. 👍 0
2. 👎 0
2. Hello Dr. Bob,
This was the equation: 2N2O(g) ---> 2N2(g) + O2

1. 👍 0
2. 👎 0
3. I'm not sure I would call that a dissociation reaction. When I think of a dissociation reaction the AgCl ==>? Ag^+ + Cl^- is one; another one is CH3COOH ==> H^+ +CH3COO^-, NaCl + H2O => Na^+(aq) + Cl^-(aq), etc.
What you have written I call a reaction( specifically a decomposition) and not a dissociation. We would guess, by the way, that the decomposition of NO2 to N2 and O2 is spontaneous because the reverse reaction is NOT spontaneous. If it were, there wouldn't be much O2 around in the atmosphere for us to breathe.

1. 👍 0
2. 👎 0
4. Ohhh.. my mistake I understand now. thanks!

1. 👍 0
2. 👎 0
5. Which of the following reactions are spontaneous (favorable)?

A. DHAP ---> glyceraldehyde - 3 - phosphate ΔG=3.8 kJ/mol
B. C2H4+H2 ----> C2H6 ΔG=-150.97kJ/mol
C. C4H4O5 ---> C4H2O4+H2O ΔG=3.1 kJ/mol
F. C6H13O9P+ATP ---> C6H14O12P2+ADP ΔG=-14.2 kJ/mol

1. 👍 0
2. 👎 0
6. its D, E,A

1. 👍 0
2. 👎 6

1. 👍 0
2. 👎 8

## Similar Questions

1. ### AP Chemistry

Calculate the delta H rxn for the following reaction: CH4(g)+4Cl2(g)-->CCl4(g)+4HCl Use the following reactions and given delta H's: 1) C(s)+2H2(g)-->CH4(g) delta H= -74.6 kJ 2) C(s)+2Cl2(g)-->CCl4(g) delta H= -95.7 kJ 3)

2. ### Chemistry

For the reaction described by the chemical equation: 3C2H2(g) -> C6H6(l) .. Delta H rxn = -633.1 kJ/mol a) Calculate the value of Delta S rxn at 25.0 C... b) Calculate Delta G rxn... c) In which direction is the reaction, as

3. ### Chemistry

If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the

4. ### chemistry

Calculate the mass of Mg metal requied to consume 2560g of CO2 in the reaction 2Mg+CO2 → 2MgO + C

1. ### chemistry

Given these reactions : X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is (delta)Hrxm for this reaction? X(s)+1/2 O2(g)+CO2(g) ---> XCO3(s) (Delta)H= ?

2. ### Chemistry

Which of the reactions are spontaneous (favorable)? a. 2H2O(g)⟶2H2(g)+O2(g) Δ𝐺=457 kJ/mol b. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) Δ𝐺=−820 kJ/mol c. 2Mg(s)+O2(g)⟶2MgO(s) Δ𝐺=−1137 kJ/mol d. C(s)+H2O(l)⟶CO(g)+H2(g)

3. ### Chemistry

Calculate Delta G for the spontaneous cell produced from the following: Al^3+ + 3e^- -> Al (s) Mg^2+ + 2e^- -> Mg (s) In order to solve this, you need to determine the half reactions..ie which is reduced and which is oxidized. How

4. ### chemistry

Reactions in which a substance decomposes by losing CO are called decarbonylation reactions. The decarbonylation of acetic acid proceeds as follows: CH3COOH(l)= CH3OH(g)+ CO(g. By using data from Appendix C in the textbook,

1. ### Chemistry

How many grams of MgO are produced during an enthalpy change of -96.0 KJ if 2Mg(s) + O2(g) -> 2MgO(s) and delta H= -1204kj

2. ### chemistry

How many grams of MgO are produced when 40.0grams of 02 react with Mg? 2mg+O2--->2mgO Could you please set the problem up? I think the answer is 101, but I do not know how to get that answer. Thank you

3. ### Chemistry

1) A reactions has a delta H of -76 Kj and a delta S of -117 J/K. Is the reaction spontaneous at 298 K? Work: Delta G= -76kJ/mol - 298K(-117J/K/1000) Delta G= -41.134 Spontaneous 2) A reaction has a delta H of 11 kJ and a delta S

4. ### Chemistry

If you had observed the fate of an ice cube at 25 degrees Celsius, what would you conclude about the spontaneity of the process H2O (s) H2O (l) ? I know for it to be spontaneous, delta G has to be negative, but how can I determine