Answer : The internal energy change is, -506.3 kJ/mol
Explanation :
Formula used :

or,

where,
= change in enthalpy = 
= change in internal energy = ?
= change in moles
Change in moles = Number of moles of product side - Number of moles of reactant side
According to the reaction:
Change in moles = 0 - 2 = -2 mole
That means, value of
= 0
R = gas constant = 8.314 J/mol.K
T = temperature = 
Now put all the given values in the above formula, we get




Therefore, the internal energy change is -506.3 kJ/mol
1.3 x 10¹⁵ : 1.2 x 10⁹ = 1.083 x 10⁶
Reactants are substances that start a chemical reaction, and products are substances that are produced in the reaction hope this helps
Answer:
I would say the answer is 2