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12 Dec 2019

Which one of the following is true?

If a reaction occurs slowly, it is nonspontaneous.

A nonspontaneous process is impossible (i.e. it can never happen).

A spontaneous reaction can be made to be spontaneous by using a catalyst.

All of these are false.

If a reaction occurs fast, it is spontaneous.

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Tod Thiel
Tod ThielLv2
13 Dec 2019

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Related questions

For each reaction, calculate ?H?rxn, ?S?rxn, and ?Grxn at 39?C.

Part A

N2O4(g)?2NO2(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part B

N2O4(g)?2NO2(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part C

N2O4(g)?2NO2(g)

Express your answer using two significant figures.
?G?rxn = kJ

Part D

State whether or not the reaction in part A is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

Express your answer using three significant figures.

Express your answer using three significant figures.

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part E

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part F

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part G

NH4Cl(s)?HCl(g)+NH3(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part H

State whether or not the reaction in part B is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part B is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part I

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part J

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part K

3H2(g)+Fe2O3(s)?2Fe(s)+3H2O(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part L

State whether or not the reaction in part C is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part C is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

Part M

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?H?rxn = kJ

Part N

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?S?rxn = J/K

Part O

N2(g)+3H2(g)?2NH3(g)

Express your answer using three significant figures.
?G?rxn = kJ

Part P

State whether or not the reaction in part D is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?C?

State whether or not the reaction in part D is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 39?

The reaction is spontaneous.
The reaction can be made spontaneous by raising the temperature.
The reaction can be made spontaneous by lowering the temperature.
The reaction can not be spontaneous at any temperature.

A process at constant T and P can be described as spontaneous if ?G < 0 and nonspontaneous if ?G > 0. Over what range of temperatures is the following process spontaneous? Assume that gases are at a pressure of 1 atm. (Hint: Use the data below to calculate ?H and ?S [assumed independent of temperature and equal to ?H° and ?S°, respectively] and then use the definition of ?G.)

2 SnO2(s) ? 2 SnO(s) + O2(g)

?Hf° (kJ mol-1) -580.7 -285.0 S° (J K-1 mol-1) 52.3 56.5 205.1

?H° = kJ ?S° = J K-1 The calculated value of T at which ?G° = 0 is K. Reaction is spontaneous .

1) You dilute 15 ml of 0.64 M HCH3COO to a total volume of 60ml.What is the molarity of acetic acid, [HCH3COO], in the dilutedsolution?
2) You have aqueous solutuin of HCl, NaCH3COO and AgNO3. What arethe ions that are present in these aqueous solution? When you mixall of the solutions together, what reaction, if any occurs?
3)What heat is given off when 2.5g of iron rust according to thefollowing reaction which has a deltaH of -1648KJ/mole?
4) Estimate deltaG for the following process.
a) spontaneous=
b) nonspontaneous=
c) process at equilibrium=

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