Question

Consider the following intermediate chemical equations.

What is the enthalpy of the overall chemical reaction?
-999 kJ
-250. kJ
250. kJ
999 kJ

Answer 1

Answer: D

Step-by-step explanation:

just took it

Answer 2

999 kJ

Step-by-step explanation:

Given are two reactions with enthalpies Δ
`H_1=-2,439\ kJ` and Δ
`H_2=3,438\ kJ`

We know enthalpy is an additive property.

Thus the overall chemical equation can be obtained from adding both the two elementary equations.

Therefore the overall enthalpy is the summation of enthalphy change in each equation.

Δ
`H_(overall) =`Δ
`H_1+`Δ
`H_2`

Δ
`H_(overall)`
`=-2,439+3,438=999\ kJ`

Therefore the overall enthalpy is 999 kJ.