For the reaction 2 H2 + O2 -> 2 H2O, if 5 moles H2 and 3 moles O2 react, how many moles of H2O are formed?

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Multiple Choice

For the reaction 2 H2 + O2 -> 2 H2O, if 5 moles H2 and 3 moles O2 react, how many moles of H2O are formed?

Explanation:
The reaction shows a 2 H2:2 H2O relationship, so the amount of water produced equals the amount of hydrogen consumed. To use all 5 moles of hydrogen, you’d need 2.5 moles of oxygen (because 2 H2 require 1 O2). You actually have 3 moles of O2, which is more than enough, so hydrogen is the limiting reagent. Therefore, all 5 moles of H2 are converted, and since 2 H2 produce 2 H2O, you get 5 moles of H2O. (There will be 0.5 moles of O2 left over.)

The reaction shows a 2 H2:2 H2O relationship, so the amount of water produced equals the amount of hydrogen consumed. To use all 5 moles of hydrogen, you’d need 2.5 moles of oxygen (because 2 H2 require 1 O2). You actually have 3 moles of O2, which is more than enough, so hydrogen is the limiting reagent. Therefore, all 5 moles of H2 are converted, and since 2 H2 produce 2 H2O, you get 5 moles of H2O. (There will be 0.5 moles of O2 left over.)

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