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4 moles of hydrogen react with 5 moles of oxygen to form water, identify the excess reagent?

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Answer:

Excess Reagent = oxygen

Step-by-step explanation:

Limiting reagent: The substance that is totally consumed when the reaction is completed.

Excess reagent: The substance left after the limiting reagent is consumed completely

The balanced chemical equation for formation of water is as follow:


<strong>2H_(2)+O_(2)\rightarrow 2H_(2)O</strong>

This means when 2 moles of hydrogen reacts with 1 mole of oxygen, 2 moles of water is produced.

Hence the ratio in which hydrogen and oxygen gas reacts is 2:1

Now if 2 mole hydrogen require 1 mole of oxygen ,then 4 mole hydrogen need 2 mole of oxygen.


<strong>H_(2):O_(2)=2:1</strong>

or


<strong>H_(2):O_(2)=4:2</strong>

Here 5 mole of oxygen is reacting but only 2 mole is required .

Oxygen is in excess.

User Pervez Alam
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