Please show all work A.)Place the following in order of decreasing standard mola
ID: 972976 • Letter: P
Question
Please show all work
A.)Place the following in order of decreasing standard molar entropy.
NaCl(s) Na3PO4(aq) NaCl(aq)
B.)Calculate the G°rxn using the following information.
G°rxn = ?
C.)Calculate the Grxn for the reaction using the following information.
4HNO3(g)+5N2H4(l)7N2(g)+12H2O(l)
Gf(HNO3(g)) = -73.5 kJ/mol;
Gf(N2H4(l)) = 149.3 kJ/mol;
Gf(N2(g)) = 0 kJ/mol;
Gf(H2O(l)) = -273.1 kJ/mol.
Explanation / Answer
A.)Place the following in order of decreasing standard molar entropy.
Entropy is a mesure of order/chaos
the more complex a molecule is, the higher entropy- The phase is also taken into consideration
From the list:
NaCl(s) --> Solids have ordered lattices and crystal formation, low entropy
Na3PO4(aq) --> aqueous solution are chaotic, expect 3 ions of Na+ and 1 ion of PO4-3 in solution
NaCl(aq) --> similar, but less chaos since there are only 2 ions
From the list
The most chaotic -->
Na3PO4(aq) > NaCl(aq) > NaCl(s)
B.)Calculate the G°rxn using the following information.
dG = dH - T*dS
dG = (Hproducts - Hreactants) - T*(dSprducts - Sreactants )
dG =(2*296.8-241.8*2 - 2*(-20.6) -3*0) - 298*(188.8*2 + 2*248.2 - 2*205.8 - 3*205)/1000
dG = 196.6748 kJ/mol
C.)Calculate the Grxn for the reaction using the following information.
4HNO3(g)+5N2H4(l)7N2(g)+12H2O(l)
dG = Gproducts - Greactants
dG = 7N2(g)+12H2O(l) - (4HNO3(g)+5N2H4(l))
dG = (7*0 + 12*(-273.1) - ((4*-73.5) + (5*149.3))
dG = -3729.7 kJ/mol
b. -3.298 x 103 kJRelated Questions
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