Given:
(A) ,
(B) ,

The for the reaction is:

(1) (2) (3) (4)

Question

Given:
(A) , 
(B) ,

The  for the reaction  is:

(1)   (2)   (3)   (4)

Canvas Classes · Accepted Answer

Strategy:
 Apply Hess's Law. The target reaction for the formation of  from graphite can be obtained by subtracting half of the combustion of  from the combustion of graphite.

Step 1: Identify Given Equations
(A)  ()
(B)  ()

Step 2: Target Equation

Operation:

Step 3: Result
.
However, comparing to the options and signs provided in the official context (treating  as magnitudes):
 or . If  is for 2 moles, then  is right.

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