compute the mass-specific enthalpy change associated with Nz that is undergoing a change in state from 400 k to 800 k

The correct answer is "430 kJ/kg". A further explanation is given below.

Explanation:

The given values are:

T₁ = 400 k

T₂ = 800 k

The average temperature will be:

=

=

=

From table,

At 600 k the will be = 1.075

Now,

⇒ The specific enthalpy =

⇒                                

⇒