Question

if 100 g of water is decomposed , how many grams if oxygen and hydrogen are obtained

Answer 1

I think orally it's 75 of hydrogen and 25 of oxygen

Answer 2

1 mol of water produces 1 mol of hydrogen and 1/2 mol of oxygen

each mol of water is 18.016 g per mol

100 g = 100/18.016 or 5.55062 moles of water

Each mol of hydrogen is 2.016 g

so it requires 2.016*100/18.016 or 11.19 g of hydrogen

oxygen required is 0.5*100/18.016 moles or 2.77531 moles