What would be the balanced equation?

Question

In the electrolytic decompostition of water, what maximum volume of oxygen gas could be produced at 15 degrees celcius, and 100.5 kPa if 250 g of water are decomposed?

What would be the balanced equation?

Answer 1

2H2O -> 2H2 + O2

18 g of H2O has 16 g of O2

So, 250 g has 250*16/18 = 222.22 g

That is 6.944 mol of O2

Thus , V = nRT/P = 6.944*8.314*288/(100.5) = 165.442 l