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For reaction: 2H2(g)+O2(g)= 2H2O(l)

What is the pressure of the excess gas when the reaction is complete if 5g of H2 and 10g of O2 react in a 15L container at a constant temp of 25 degrees C? I understand PV= nRT know I need to figure out what n is and the word "excess gas"--- is that just the overall P for the equation tha t I' solving for?

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