the sign are either going to be positive or negative a)Ag + (aq) + Br- (aq) -->

Question

the sign are either going to be positive or negative

a)Ag + (aq) + Br- (aq) --> AgBr(s)

b) 2N2O(g) --> 2N2(g)+O2(g)

c)2KClO3 (s)--> 2KCl(s) + 3O2 (g)

d)2Mg(s) + O2(g)--> 2MgO (s)

e)C7H16(g) +11O2(g) --> 7CO2(g) + 8H2O(g)

f)CH3OH(l) --> CH3OH(g)

Part B

Calculate the standard entropy change for the reaction

2Mg(s)+O2(g)?2MgO(s)

using the data from the following table:

Express your answer to four significant figures and include the appropriate units.

Substance ?H?f (kJ/mol) ?G?f (kJ/mol) S? [J/(K?mol)] Mg(s) 0.00 0.00 32.70 O2(g) 0.00 0.00 205.0 MgO(s) -602.0 -569.6 27.00 predict the sign of entropy change, Delta S for each of the reaction displayed the sign are either going to be positive or negative a)Ag + (aq) + Br- (aq) --> AgBr(s) b) 2N2O(g) --> 2N2(g)+O2(g) c)2KClO3 (s)--> 2KCl(s) + 3O2 (g) d)2Mg(s) + O2(g)--> 2MgO (s) e)C7H16(g) +11O2(g) --> 7CO2(g) + 8H2O(g) f)CH3OH(l) --> CH3OH(g) Part B Calculate the standard entropy change for the reaction 2Mg(s)+O2(g)?2MgO(s) using the data from the following table: Express your answer to four significant figures and include the appropriate units. ? S ?

Explanation / Answer

a) entropy change is negative (its a conversion of liquid to solid)

b) entropy is positive (The number of mols of gaseous reactants are more than the number of mols of gaseous products)

c) entropy is positive (The number of mols of gaseous reactants are more than the number of mols of gaseous products)

d) entropy is negative ( The number of mols of gaseous reactants are lesser than the number of mols of gaseous products)

e) entropy is positive (The number of mols of gaseous reactants are more than the number of mols of gaseous products)

f) entropy is positive (conversion from liquid to gas)

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Part:B

Delta S(Reaction) = [27.00 J/K.mol*2]- [2(32.70 J/K.mol) +205 J/K.mol ]

                          = -243.4 J/mol

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