in the reaction 2H2O-->2H2 + O2, if you start with 2 mol of water, how many moles of hydrogen gas are formed
in the reaction 2H2O-->2H2 + O2, if you start with 2 mol of water, how many moles of hydrogen gas are formed and if you start with 4 mol of waterSubmitted: 2421 days ago
2 H2O â†’ 2 H2 + O2
Those numbers in front of the compounds/elements represent the number of moles.
If you start with 4 moles of H2O
4 H2O â†’ 4 H2 + 2 O2
So, 4 moles of Hydrogen are produced from 4 moles of H2O.
well the mole to mole ratio for H20 to 2H2 is 1 to 1, so I think you'd just get 2 moles...
I like to do it this way. Divide everythign by 2.....
H2O ---> H2 + 1/2 O2
So now you have what 1 mole of water gives you
You want to know what 2 moles give you. Multiply everything by 2. .... You get 2 moles of H2 gas
multiply everythign by 4
You get 4 moles of H2 gas.
Also you should notice....the molar ratio of H20 to H2 are 2:2 ..which reduces to 1:1. So every 1 mole of water used = 1 mole of H2 formed
If you start with 2H2O and finish with 2H2, you have 2 moles of water and 2 moles of hydrogen.