Hydrazine,N₂H₄,is a Liquid Used as a Rocket Fuel $\to$ N₂(g)+ 2 H₂O( )
the Reaction of 6

Hydrazine,N₂H₄,is a liquid used as a rocket fuel.It reacts with oxygen to yield nitrogen gas and water.

N₂H₄( ) + O₂(g) $\to$ N₂(g) + 2 H₂O( )
The reaction of 6.50 g N₂H₄ evolves 126.2 kJ of heat.Calculate the enthalpy change per mole of hydrazine combusted.

A) -19.4 kJ/mol
B) -25.6 kJ/mol
C) -126 kJ/mol
D) -622 kJ/mol
E) -820.kJ/mol