Question

The reaction between hydrogen and oxygen to form water is given as: \( 2H_2 + O_2 \rightarrow 2H_2O \). If 4 moles of hydrogen react with excess oxygen, how many moles of water will be formed?

• A. 1 mole
• B. 2 moles
• C. 4 moles
• D. 8 moles

Hint:

When balancing chemical reactions, use stoichiometric ratios to calculate the amount of product formed from the reactants.

Answer 1

The Correct Option is C

From the balanced equation \( 2H_2 + O_2 \rightarrow 2H_2O \), we see that 2 moles of hydrogen gas produce 2 moles of water. Therefore, if 4 moles of hydrogen are used, the number of moles of water produced will be: \[ \frac{2 \, \text{moles of water}}{2 \, \text{moles of hydrogen}} \times 4 \, \text{moles of hydrogen} = 4 \, \text{moles of water} \] Thus, 4 moles of water will be formed.