Calculating the mass of a reactant The reaction between H2 and O2 and produces 26.2 g water. How many grams of O2 reacted?​

23.3 grams

Explanation:

First we'll need the balanced equation for this equation.

2H₂ + O₂ → 2H₂O

This shows us that we need one mole of O₂ to produce two moles of water.

Now we need to convert grams to moles.

There is 18.01528 g for every mole of water

26.2/18.01528 = 1.454321

There 1.454321 moles of water produced

Remember that two moles of water are produced from a gram of O₂

1.454321/2 = 0.72716

0.72716 moles of O₂ were used

Now convert moles back to grams. There are 31.998 g for every mole of O₂

31.998 x 0.72716 = 23.2677

23.2677 grams of oxygen were used

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