Ten moles of hydrogen are allowed to react with 6 moles of oxygen. How much water will be obtained from reaction on complete consumption of one gas?
Correct answer: A. 10 moles.
- A. 10 moles.
- B. 8 moles.
- C. 6 moles.
- D. 4 moles.
Explanation
Balance chemical equation2H2 + O2 -> 2H20Now we will compare the moles of H2 and O2 with water from the balanced chemical equation.H2 : H202 : 210 : 10O2 : H201 : 26 : 2x6=12The number of moles of water produced by hydrogen is less so hydrogen will be limiting reactant and it will limit the yield of water thus, 10 moles of water produced.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Limiting and Excess Reactants
Limiting and excess reactants are identified from the balanced chemical equation and the available amounts of each substance. The limiting reactant determines the maximum product formed, while the excess reactant remains after completion, so questions require mole ratios, theoretical yield and sometimes percentage yield calculations.
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