Calculate the number of:
(a) Particles in 0.1 moles of any substance,
(b) Hydrogen atoms in 0.1 mole of $H_{2}S{O}_4$
(c) Molecules in one kg of calcium chloride.

Q. One mole of any substance contains $6.022\times {10}^{23}$ atoms/molecules. Number of molecules of $H_{2}S{O}_4$ present in 100 mL of 0.02M $H_{2}S{O}_4$ solution is ___.

Q. Calculate the number of oxygen atoms in 0.1 mole of sulphur dioxide molecules.

Q. Fill in the following blanks :
(a) 1 mole contains ...................... atoms, molecules or ions of a substance.
(b) A mole represents an ..................... number of particles of a substance.
(c) 60 g of carbon element are ................... moles of carbon atoms.
(d) 0.5 mole of calcium element has a mass of ......................
(e) 64 g of oxygen gas contains ....................... moles of oxygen atoms.

Q. $1)$In three moles of ethane $C_2{H}_6,$ calculate the following:

$A)$ Number of moles of carbon atoms.

$2)$In three moles of ethane $C_2{H}_6,$ calculate the following:

$B)$ Number of moles of hydrogen atoms.

$3)$In three moles of ethane $C_2{H}_6,$ calculate the following:

$C)$ Number of molecules of ethane.

Q. Calculate the no. of molecules in one kg of calcium chloride.