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Anonymous asked in Science & MathematicsChemistry · 1 month ago

Consider the following reaction: 2H 2 + O 2 --> 2H 2O How many moles of water can be formed from 1 mole of H2 and 2 moles of O2? ?

3 Answers

  • 1 month ago

    2H2 + O2 = 2H2O 

    The molar ratios are 2:1::2 

    From the molar ratios 

    2moles (H2) forms 2 moles (H2O)


    1 mole (H2) forms 1 mole (H2O) 

    NB moles (O2) used is 1/2 mole . Since there is present 2 moles(O2) then you are left with 1.5 moles

     (O2) which is unused. 

  • 1 month ago

    1 mole of H2 would react completely with 1 x (1/2) = 0.5 mole of O2, but there is more O2 present than that, so O2 is in excess and H2 is the limiting reactant.

    (1 mol H2) x (2 mol H2O / 2 mol H2) = 1 mol H2O

  • 1 month ago

    1.  Then all the H2 will be used up.

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