When nitric acid reacts with hydrazine (i.e. dinitrogen tetrahydride), nitrogen gas an water are formed. The temperature is constant at 25°C. 4 HNO3(aq) +5 N₂H4(l) → 7 N₂(g) + 12 H₂O(/) Substance HNO3 (aq) H₂O (/) N₂ (g) N₂H4 (/) AH, (kJ/mol) -133.9 -285.8 0 +50.6 a. Calculate AH (in kJ/mol) and AS (in kJ/mol K). b. Calculate AG (in kJ/mol). C. Determine K for this reaction. Sº (kJ/mol K) 0.2669 0.0700 0.1916 0.1212

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Chapter1: Chemical Foundations
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When nitric acid reacts with hydrazine (i.e. dinitrogen tetrahydride), nitrogen gas and 
water are formed. The temperature is constant at 25°C.
4 HNO3(aq) + 5 N2H4(l) " 7 N2(g) + 12 H2O(l)
Substance ΔHf° (kJ/mol) S° (kJ/mol K)
HNO3 (aq) –133.9 0.2669
H2O (l) –285.8 0.0700
N2 (g) 0 0.1916
N2H4 (l) +50.6 0.1212
a. Calculate ΔH° (in kJ/mol) and ΔS° (in kJ/mol K).
b. Calculate ΔG° (in kJ/mol).
c. Determine K for this reaction.

When nitric acid reacts with hydrazine (i.e. dinitrogen tetrahydride), nitrogen gas and
water are formed. The temperature is constant at 25°C.
4 HNO3(aq) + 5 N₂H₂(1)→7 N₂(g) + 12 H₂O(/)
Substance
HNO3 (aq)
H₂O (I)
N₂ (g)
N₂H4 (1)
a. Calculate AH (in kJ/mol) and AS* (in kJ/mol K).
b. Calculate AG* (in kJ/mol).
AH₂° (kJ/mol)
-133.9
-285.8
0
+50.6
c. Determine K for this reaction.
Sº (kJ/mol K)
0.2669
0.0700
0.1916
0.1212
Transcribed Image Text:When nitric acid reacts with hydrazine (i.e. dinitrogen tetrahydride), nitrogen gas and water are formed. The temperature is constant at 25°C. 4 HNO3(aq) + 5 N₂H₂(1)→7 N₂(g) + 12 H₂O(/) Substance HNO3 (aq) H₂O (I) N₂ (g) N₂H4 (1) a. Calculate AH (in kJ/mol) and AS* (in kJ/mol K). b. Calculate AG* (in kJ/mol). AH₂° (kJ/mol) -133.9 -285.8 0 +50.6 c. Determine K for this reaction. Sº (kJ/mol K) 0.2669 0.0700 0.1916 0.1212
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