Tag: avogadro's law

Questions Related to avogadro's law

Two gases A and B which react according to the equation $\displaystyle :aA _{(g)}+bB _{(g)}\rightarrow cC _{(g)}+dD _{(g)}$ to give two gases C and D are taken (amount not known) in an Eudiometer tube (operating at a constant pressure and temperature) to cause the above. If on causing the reaction there is no volume change observed then which of the following statement are correct :

chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

  1. $\displaystyle :\left ( a+b \right)= \left ( c+d \right )$

  2. Average molecular mass may increase or decrease if either of A or B is present in limited amount.

  3. Vapour Density of the mixture will remain same throughout the course of reaction.

  4. Total moles of all the component of mixture will change.

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Correct Option: A,C

Statement 1: At the same temperature and pressure, 1 L of hydrogen gas and  1 L of neon gas have the same mass.
Statement 2: Equal volumes of ideal gases at the same temperature and pressure contain the same number of moles.

chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

  1. Both statement 1 and statement 2 are correct and statement 2 is the correct explanation of statement 1

  2. Both statement 1 and statement 2 are correct but Statement 2 is not the correct explanation of Statement 1

  3. Statement 1 is correct but statement 2 is incorrect

  4. Statement 1 is incorrect but statement 2 is correct

  5. Both the statement 1 and statement 2 are incorrect

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Correct Option: D
Explanation:

Statement 1: At the same temperature and pressure, 1 L of hydrogen gas and  1 L of neon gas have the same volume.
Statement 2: Equal volumes of ideal gases at the same temperature and pressure contain the same number of moles.
For example, 1 mole of any gas at STP will occupy a volume of 22.4 L.
Hence, statement 1 is not correct but statement 2 is correct.

"All gases have the same number of moles in the same volume at constant temperature and pressure:. This statments belongs to :

chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

  1. Boyle's law

  2. Charles's law

  3. Avogadro's principle

  4. ideal gas law

  5. Dalton's law

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Correct Option: C
Explanation:

Avogadro's law (sometimes referred to as Avogadro's hypothesis or Avogadro's principle) is an experimental gas law relating volume of a gas to the amount of substance of gas present.
Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules".
For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

Avogadro's law shows the relationship between which two variables?

chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

  1. Volume and number of moles

  2. Pressure and number of moles

  3. Volume and pressure

  4. Temperature and pressure

  5. Temperature and number of moles

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Correct Option: A
Explanation:

(A) : Volume and number of moles, : at constant pressure.
Avogadro Law: At the same condition of temperature and pressure the volume of the gas is directly proportional to the number of the moles.

Statement I : At STP, 22.4 liters of He will have the same volume as one mole of $\displaystyle { H } _{ 2 }$ (assume ideal gases).
Statement II : One mole or 22.4 liters of any gas at STP will have the same mass.

chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

  1. true, false

  2. false, true

  3. true, true, correct explanation

  4. true, true, not correct explanation

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Correct Option: A
Explanation:

Avogadro’s law states that under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules. This empirical relation can be derived from the kinetic theory of gases under the assumption of a perfect (ideal) gas. The law is approximately valid for real gases at sufficiently low pressures and high temperatures.
At STP, all gas have same volume for 1 mol of gas and that volume is always equal to the 22.4 L.