Tag: avogadro's law

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Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

If  $N _ { A }$ is Avogadro's number, then calculate the number of electrons in  $4.2\ g$  of  $N ^ { 3- }$.

  1. $2.1 N _ { A }$
  2. $3 N _ { A }$
  3. $6 N _ { A }$
  4. $ N _ { A }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
$N^{3-}$ contains 10 electrons.

Number of moles $= \dfrac {4.2}{14} $
                                     
                                       $=0.3\ moles$

No of electrons in $0.3\ moles = 0.3\times N _A\times 10$

                                        $=3\ N _A$

Hence, option B is correct.
Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

Mass of the one atom of the element X is $1.66 \times 10^{-26}$ g. Number of atoms in 1 g of the element is:

  1. $1.66 \times 10^{-26}$
  2. $1.66 \times 10^{25}$
  3. $1.66 \times 10^{-24} x No$
  4. $6.024 \times 10^{25}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mass of one atom = $1.66 \times 10^{-26} g$
$1.66 \times 10^{-26} gm \rightarrow 1 \, atom$
$1 \, gm \rightarrow \dfrac{1}{1.66 \times 10^{-26}} $ atom
$= 6.024 \times 10^{25} atom$

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

Which of the following represents the Avogadro number?

  1. Number of molecule present in 1 L of gas at N.T.P

  2. Number of molecule present in 22.4 L of gas at N.T.P

  3. Number of molecule present in 22.4 of gas at 298K and 1 atm pressure

  4. Number of molecule present in one mole of gas at any temp and pressure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Avogadro's number (6.022 x 10^23) represents the number of particles (atoms or molecules) in exactly one mole of a substance, regardless of the temperature or pressure.

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

A vessel contains N molecules of oxygen at a certain temperature and pressure. How many molecules of sulphur dioxide can the vessel accommodate at the same temperature and pressure.

  1. N

  2. 2N

  3. N/2

  4. 4N
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As both have same volume and according to avagadro's law, equal volume of gases contains equal molecules so sulphur dioxide contains N molecules.

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

The gases chlorine, nitrogen, ammonia and sulphur dioxide are collected under the same conditions of temperature and pressure. If 20 litres of nitrogen contains 'x' no. of molecules, state the no. of molecules in 20 litres of ammonia.

  1. x

  2. x/2

  3. x/4

  4. 2x
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to avagadro's law, equal volume of gases contains equal number of molecules. Therefore,  20 litres of ammonia will contain x number of molecule. 

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

A vessel contains X number of molecules of hydrogen gas at a certain temperature and pressure. Under the same conditions of temperature and pressure, how many molecules of nitrogen gas would be present in the same vessel?

  1. 2X

  2. X

  3. 0.5X

  4. 3X
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules" so same volume of nitrogen will have X number of molecules.

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law
Statement: Equal volumes of all gases always contain equal number of moles.

State whether the given statement is true or false.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Avogadro law: It states that equal volumes of all gases under the same conditions of temperature and pressure contain the equal number of molecules. 

This means that as long as the temperature and pressure remain constant, the volume depends upon number of molecules of the gas.

Since volume of a gas is directly proportional to the number of moles; one mole of each gas at standard temperature and pressure (STP) will have same volume. 

Hence, the given statement is $\text{true}$

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

If $1$ L of $O _2$ at $15^oC$ and $750$ mm pressure contains $\text N$ molecules, the number of molecules in $2$ L of $SO _2$ under the same conditions of temperature and pressure will be :

  1. $\dfrac {\text N}{2}$
  2. $\text N$
  3. $2\text N$
  4. $4\text N$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Under similar conditions of temperature and pressure, equal volume of gas contains equal number of molecules.
$\therefore 1\ L=N$ molecules
$2\ L=2\ N$ molecules

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

Under the same conditions, two gases have the same number of molecules. They must:

  1. be noble gases

  2. have equal volumes
  3. have a volume of 22.4 dm$^3$ each

  4. have an equal number of atoms
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Avogadro's hypothesis: Equal volume of all gases have equal number of molecules (not atoms) at same temperature and pressures conditions.

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

Four 1-1 litre flasks are separately filled with the gases $H _2,\, He,\, O _2$ and ozone. The ratio of total number of atoms of these gases present in different flask would be : 

  1. 1 : 1 : 1 : 1

  2. 1 : 2 : 2 : 3

  3. 2 : 1 : 2 : 3

  4. 3 : 2 : 2 : 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to Avogadro's law, all gases at same temperature and pressure will contain same number of molecules. Hence, number of molecules of all gases will be same bt ration of atoms of each gases will $2:1:2:3$.