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Question

How many liters of hydrogen gas, measured at 0.940atm and 32 degree C, will result from decomposition of 10 grams of water through electrolysis (running electricity through it)?

Answer 1

2H2O ==> 2H2 + O2 

Find moles of H2O in 10 grams of H2O

From the stoichiometry, find moles of H2 produced from that many moles of H2O (2moles H2O = 2moles H2 gas)

From moles of H2 gas, convert to liters using PV = nRT and solve for V