What Is the Standard Enthalpy of Formation of Liquid Diethylamine,(CH₃CH₂)₂NH

Multiple Choice

What is the standard enthalpy of formation of liquid diethylamine,(CH₃CH₂) ₂NH?
N₂O₅(g) + 8CH₄(g) → 2(CH₃CH₂) ₂NH(l) + 5H₂O(l) ; ΔH° = -1103 kJ
Substance
ΔH°_f (kJ/mol)
N₂O₅(g)
+11) 3
CH₄(g)
-74) 9
H₂O(l)
-285.8

A) -131 kJ/mol
B) -421 kJ/mol
C) +131 kJ/mol
D) -1452 kJ/mol
E) +421 kJ/mol