For the theoretically perfect reaction 2h2 + o2 > 2h2o, if you react 300 molecules of hydrogen and 200 molecules of oxygen, how many oxygen molecules will you have that do not engage in the reaction?

Answer : The number of oxygen molecules that do not engage in the reaction are 50 molecules.

Explanation :

The balanced chemical reaction is,

From the balanced chemical reaction we conclude that,

As, 2 molecules of hydrogen react with 1 molecule of oxygen

So, 300 molecules of hydrogen react with molecules of oxygen

The number of oxygen molecules reacted = 150 molecules

Now we have to determine the number of oxygen molecules that do not engage in the reaction.

Number of oxygen molecules left = Given number of oxygen molecules - Number of oxygen molecules reacted

Number of oxygen molecules left = 200 - 150

Number of oxygen molecules left = 50 molecules

Therefore, the number of oxygen molecules that do not engage in the reaction are 50 molecules.

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