When 8 grams (4 moles) of H2 react with 2 moles of O2, how many moles of water will be formed?
Correct answer: B. Four
- A. Five
- B. Four
- C. Six
- D. Three
Explanation
2H₂ + O₂ → 2H₂OThis equation indicates that 2 moles of hydrogen (H₂) react with 1 mole of oxygen (O₂) to produce 2 moles of water (H₂O). You have 4 moles of H₂ and 2 moles of O₂. Since 2 moles of O₂ are available, they will react completely with 4 moles of H₂. Thus, when 8 grams (4 moles) of H₂ react with 2 moles of O₂, you will produce 4 moles of water (H₂O).
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Fundamental Concepts of Chemistry
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.
Practise Fundamental Concepts of Chemistry
898 free Fundamental Concepts of Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Fundamental Concepts of Chemistry questions
How many atoms of carbon are present in 18g of glucose?
What will be the values of temperature and pressure at standard condition (SIP).
The most doubtful yield is:
The molar volume of SO2 gas at STP is:
Determinate the number of moles of O in 10.6g of Na2 CO3
Calculate the number of grams of H2O formed when 8g of CH4 burns in excess of oxygen.