You have 16.7 grams of hydrogen and 15.4 grams of oxygen in a synthesis rxn. Which is the limiting reagent?

Oxygen is the limiting reagent.

Explanation:

2H₂ + O₂ → 2H₂O

Molar mass of H₂ = 2 g

Molar mass of O₂ = 32g

According to the balanced equation:

2 X 2g of H₂ reacts with 32 g of O₂

4g of H₂ reacts with 32g of O₂

1g of H₂ will react with = 8g of O₂

So, 16.7g of H₂ will react with = 133.6g of O₂

However, O₂ is just 15.4g

Since O₂ is present in less quantity, O₂ is the limiting reagent.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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i'm assuming that the correct answer is indeed the first one/ "a"..