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Anonymous
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

Relevance
• 2H2 + O2 = 2H2O

The molar ratios are 2:1::2

From the molar ratios

2moles (H2) forms 2 moles (H2O)

Hence

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 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.  Then all the H2 will be used up.

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