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the question is: calculate the theoretical volume of gas produced at 25 C and 100kPa by the reaction of zinc with 200mL HCl. Its Q22 from the 2005 HSC

How do u calculate the theoretical volume of gas produced in a reaction? Help!

Yeah i know that, but what effect does bubbling hydrogen gas over the inert electrde have - i.e does it effect whether the hydrogen oxidises or reducts?

If you have a galvanic cell with a Zn electrode and Zn ions in solution on one side and a Pt electrode with H2 gas being bubbled over it and H ions in solution which is the oxidising and which is reducing. (what is the effect of the H2 gas)