Mole Concept

What is the name given to the number  $6.022\times {10}^{23}$ ?

What is the numerical value of Avogadro's number?

The mass of one atom of an element $\mathrm{X}$ is $2.0\times {10}^{-23} \mathrm{g}$. What could element $\mathrm{X}$ be?

The mass of one atom of an element $\mathrm{X}$ is $2.0\times {10}^{-23} \mathrm{g}$. Calculate the atomic mass of element $\mathrm{X}$.

The mass of one molecule of a substance is $11.79\times {10}^{-26} \mathrm{kg}$. Calculate its molar mass? What could this substance be?

Calculate the number of moles and molecules in $11 \mathrm{g}$ of carbon dioxide.

Calculate the number of moles and molecules in $4 \mathrm{g}$ of oxygen.

If $1\mathrm{g}$ of sulphur dioxide contains $\mathrm{X}$ molecules, what will be the number of molecules in $1\mathrm{g}$ of methane?

(Atomic masses $\mathrm{S}=32.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}$)

Which of the following weighs most?

(i)$0.1$ mole of sodium (ii)${10}^{23}$ molecules of ${\mathrm{SO}}_2$

(iii) $0.1\mathrm{g}$ atom of iron (iv) ${10}^{23}$ atoms of silver

(Atomic masses $\mathrm{Na}=23.0\mathrm{u}, \mathrm{S}=32.0\mathrm{u}, 0=16.0\mathrm{u}, \mathrm{Fe}=56.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}$)

What mass of each element is present in $1.5$ moles of sodium sulphite$\left({\mathrm{Na}}_2{\mathrm{SO}}_3\right)$?

Which contains more molecules, $10\mathrm{g}$ of ${\mathrm{SO}}_2$ or $10\mathrm{g}$ of ${\mathrm{O}}_2$?

(Atomic masses $\mathrm{S}=32.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}$)

Find the ratio of molecules present in $4.4\mathrm{g}$ of ${\mathrm{CO}}_2$, and $1.6\mathrm{g}$ of ${\mathrm{SO}}_2$.

( Atomic masses $\mathrm{C}=12.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{S}=32.0\mathrm{u}$)

How many atoms and molecules are present in $124\mathrm{g}$ of phosphorus $\left({\mathrm{P}}_4\right)$?

(Atomic mass of $\mathrm{P}=31.0\mathrm{u}$)

Calculate the number of atoms of each kind present in $3.42\mathrm{g}$ of cane sugar $\left({\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right)$.

What will be the mass of ${\mathrm{Na}}_2{\mathrm{CO}}_3$ which contains the same number of molecules as contained in $12.3\mathrm{g}$ of ${\mathrm{MgSO}}_4.7{\mathrm{H}}_2\mathrm{O}$?

(Atomic masses $\mathrm{Na}=23.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{Mg}=24.0\mathrm{u}, \mathrm{S}=32.0\mathrm{u}$)

Calculate the number of oxygen atoms present in $88\mathrm{g}$ of ${\mathrm{CO}}_2$. What will be the mass of $\mathrm{CO}$ having the some number of oxygen atoms?

Calculate the mass of carbon dioxide which contains the same number of molecules as are contained in $40.0\mathrm{g}$ oxygen.

Calculate the mass of one molecule of benzene $\left({\mathrm{C}}_6{\mathrm{H}}_6\right)$. 

(Atomic masses : $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of one molecule of water.

(Atomic masses : $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)

Calculate the mass of one molecule of oxygen.

(Atomic masses: $\mathrm{N}=14.0\mathrm{u}, \mathrm{Ag}=108.0\mathrm{u}, \mathrm{O}=16.0\mathrm{u}, \mathrm{H}=1.0\mathrm{u}, \mathrm{C}=12.0\mathrm{u}$)