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Can you explain the answer of this question below:
100mL of gaseous hydrogen combines with 50mL of gaseous oxygen to give 100mL of water vapours. This can be explained on the basis of:
  • A:
    Law of definite proportions
  • B:
    Gay Lussac’s law
  • C:
    Law of multiple proportions
  • D:
    Avogadro law
The answer is b.

Ref: https://edurev.in/question/451829/Can-you-explain-the-answer-of-this-question-below100mL-of-gaseous-hydrogen-combines-with-50mL-of-gas

Law of Combining Volume Gay Lussac established this law. According to this law, the volumes of reactants and products involved in gaseous reactions are related to each other by small integers, provided the volumes are measured at the same temperature and pressure conditions. For example, in the reaction involving hydrogen and oxygen gases to give water vapour, it is found that two volumes of hydrogen combine with one volume of oxygen to give two volumes of water.

Gay Lussac’s law - Class 11

Gay Lussac’s law - Class 11

100 ml of hydrogen combine with 50 ml of oxygen to give 100 ml of water vapour. Thus, the volumes of hydrogen and oxygen which combine together (i.e. 100 ml and 50 ml) bear a simple ratio of 2:1. Gay-Lussac's discovery of integer ratio in volume relationship is actually the law of definite proportions by volume. 

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FAQs on Gay Lussac’s law - Class 11

1. What is Gay Lussac's law and how is it related to Class 11?
Ans. Gay Lussac's law states that the pressure of a gas is directly proportional to its temperature, provided that the volume and amount of gas remain constant. This law is studied in Class 11 as part of the chapter on gases in the physics or chemistry syllabus.
2. How can Gay Lussac's law be mathematically represented?
Ans. Gay Lussac's law can be mathematically represented as P1/T1 = P2/T2, where P1 and P2 are the initial and final pressures of the gas, and T1 and T2 are the initial and final temperatures of the gas, measured in Kelvin.
3. What are the applications of Gay Lussac's law in real-life?
Ans. Gay Lussac's law finds its applications in various real-life scenarios. It helps in understanding the behavior of gases in hot air balloons, where the temperature of the gas inside the balloon affects its pressure. It is also applied in the functioning of internal combustion engines, where the increase in temperature leads to an increase in pressure, causing the expansion of gases and powering the engine.
4. How does Gay Lussac's law differ from Boyle's law?
Ans. Gay Lussac's law relates the pressure and temperature of a gas, whereas Boyle's law relates the pressure and volume of a gas. Boyle's law states that the pressure of a gas is inversely proportional to its volume, provided that the temperature and amount of gas remain constant. Both laws describe different aspects of gas behavior and are used to understand and predict gas properties.
5. Can Gay Lussac's law be applied to all gases?
Ans. Gay Lussac's law can be applied to all gases as long as the volume and amount of gas remain constant. However, this law is more accurate for ideal gases at low pressures and high temperatures. At high pressures or when the gas molecules interact strongly with each other, the behavior may deviate from what is predicted by Gay Lussac's law.
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