Hydrogen peroxide decomposes to produce water and oxygen. Which relationship regarding the quantities of reactants and products associated with this reaction is not correct?
2H₂O₂ $\rightarrow$ 2H₂O + O₂

Question

Hydrogen peroxide decomposes to produce water and oxygen. Which relationship regarding the quantities of reactants and products associated with this reaction is not correct?
2H₂O₂

\rightarrow

2H₂O + O₂

Quizplus · Accepted Answer

According to the balanced chemical equation, for every 2 moles of hydrogen peroxide, 2 moles of water and 1 mole of oxygen are produced. This means that the ratio between the moles of reactants and products is 2:2:1 or simply 2:1.

For option A:
The molar mass of HF is 20.0 g/mol, so 68.0 g is equivalent to 3.4 moles. Based on the ratio above, we would expect 6.8 moles of water and 3.4 moles of oxygen to be produced. This corresponds to a mass of 36.0 g and 32.0 g, respectively. Therefore, this option is correct.

For option B:
Using the molar mass of HF as above, 34.0 g is equivalent to 1.7 moles. Based on the ratio above, we would expect 3.4 moles of water and 1.7 moles of oxygen to be produced. This corresponds to a mass of 18.0 g and 16.0 g, respectively. Therefore, this option is correct.

For option C:
Using the molar mass of HF as above, 90.5 g is equivalent to 4.53 moles. Based on the ratio above, we would expect 9.06 moles of water and 4.53 moles of oxygen to be produced. This corresponds to a mass of 47.9 g and 42.6 g, respectively. Therefore, this option is correct.

For option E:
The given expression is difficult to simplify, but we can see that it does not follow the 2:1 ratio of reactants and products. Therefore, this option is incorrect.

For option D:
This option is in terms of a variable x, which we can assign any value to. However, according to the ratio above, the amount of oxygen produced is always half the amount of hydrogen peroxide consumed. Therefore, the correct relationship would be 2x g of hydrogen peroxide produces 2x/2 or simply x g of oxygen. This corresponds to option D.

Hydrogen Peroxide Decomposes to Produce Water and Oxygen →\rightarrow→ 2H2O + O2 A) 68

Hydrogen Peroxide Decomposes to Produce Water and Oxygen $\rightarrow$ 2H₂O + O₂
A) 68