What is the internal energy of 2.00 mol of diatomic hydrogen gas (h2) at 35°c?
i think the formula is (5/2) (nrt) but i'm not sure if i am supposed to multiply everything by 5 and then take the square root or just multiply the 5/2 into the

As you mentioned, we will use Equipartition Theorem.
H2 has 5 degrees of freedom; 3 translations and 2 rotation
Therefore:
Internal energy = (5/2) nRT
You just substitute in the equation with the values of R and T and calculate the internal energy as follows:
Internal energy = (5/2) x 2 x 8.314 x 308 = 32.0089 x 10^3 J

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