(Answered) Estimate the free energy change deltagrxn for the following

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Estimate the free energy change (ΔG_rxn) for the following reaction at 298 K, if each gaseous substance is present at p = 0.40 atm.

N₂(g) + 3H₂(g) ? 2NH₃(g)Enter your answer in kJ.

I know you have to calculate the Delta G first and then use the equation Delta G= Delta_o+RT ln(Q) but I am unsure how to get Q and how the atm is included.

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