Tag: atoms and molecules

Questions Related to atoms and molecules

A sample of gas has a volume of 0.2 litres measured at 1 atm pressure and $0^oC$. At the same pressure, at $273^oC$, its volume will become:

chemistry atoms and molecules avogadro hypothesis avogadro's law avogadro law

  1. 0.1 litre

  2. 0.4 litre

  3. 0.8 litre

  4. 0.6 litre

Show answer
Correct Option: B
Explanation:

According to Charles's law


$\dfrac{V _1}{T _1}=\dfrac{V _2}{T _2}$

$\dfrac{0.2}{273}=\dfrac{V}{546}$

$V=0.4\ litres$

Weight of 22.4 litres of $Cl _2$ gas at STP is:

chemistry atoms and molecules avogadro hypothesis avogadro's law avogadro law

  1. 17.25 g

  2. 35.5 g

  3. 73 g

  4. None

Show answer
Correct Option: D
Explanation:

Volume occupied by 1 mole of any gas at STP is 22.4 litres. Therefore, in the question, we are given 1 mole of $Cl _2$ gas, which weigh 71 g.

A gas is initially at $1$ atm pressure. To compress it to $1/4$ th of its initial volume, pressure to be applied is:

chemistry atoms and molecules avogadro hypothesis avogadro's law avogadro law

  1. $1$ atm

  2. $2$ atm

  3. $4$ atm

  4. $1/4$ atm

Show answer
Correct Option: C
Explanation:

According to boyle's law,


$P _1V _1=P _2V _2$

$\Rightarrow 1.V=\frac{V}{4}.P _2$

$\Rightarrow P _2=4\ atm$

Hence, the correct option is $C$