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What is limiting reactant in chemistry?

CHEMISTRY HELP!! limiting reactant/stoichiometry help!!!!?

  • ok. i dont get limiting reactant AT ALL. i understand stoichiomety perfectly. so in the worksheet it says "for each of the following reactions, assume you have 1 mole of each reactant. determine the limiting reactant." #1 is : S8 + 12O2 ---> 8SO3 i realli dont know where to even start. any help would be appreciated!

  • Answer:

    The limiting reagent always gets used up, thus as its name suggests, preventing the reaction from progressing any further. In the question above, the limiting reagent is clearly O2. For this reaction to see success, for every mole of S8 12 moles of O2 are needed. However, as stated above, there is only one mole of each, which means when the oxygen has fully reacted, only 1/12 of the S8 will have reacted. Thus, the absence of oxygen from this point on prevents the reaction from taking place, and thus O2 is the limiting reagent.

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The limiting reagent always gets used up, thus as its name suggests, preventing the reaction from progressing any further. In the question above, the limiting reagent is clearly O2. For this reaction to see success, for every mole of S8 12 moles of O2 are needed. However, as stated above, there is only one mole of each, which means when the oxygen has fully reacted, only 1/12 of the S8 will have reacted. Thus, the absence of oxygen from this point on prevents the reaction from taking place, and thus O2 is the limiting reagent.

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