When 8 grams (4 moles) of H2 react with 2 moles of O2 , how many moles of water will be formed?
Correct answer: B. 4
- A. 5
- B. 4
- C. 6
- D. 3
Explanation
The balanced chemical equation for the reaction between hydrogen gas and oxygen gas to form water is:2H2 + O2 → 2H2OFrom the equation, we can see that 2 moles of hydrogen gas react with 1 mole of oxygen gas to form 2 moles of water. Therefore, 4 moles of hydrogen gas will react with (1/2) x 4 = 2 moles of oxygen gas to form (2 x 4) = 8 moles of water.So, the answer is 8/2 = 4 moles of water.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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