Question

Calculate the number of molecules and atoms in 0.3 moles Of SO2​

Answer 1

Answer:

Number of atoms in 0.3moles of SO$_{2}$ is 18.062×$10^{23}$ and molecule is 0.0277×$10^{23}$

Explanation:

(1) For atoms:-

1mole of SO$_{2}$ contains 1mole of S and 2 mole of O atoms.

no. of S atoms= 6.022×$10^{23}$

no. of O atoms= 2× 6.022×$10^{23}$

                        = 12.04×$10^{23}$

Therefore total no. of atoms in SO$_{2}$ = 6.022×$10^{23}$ + 12.04×$10^{23}$

                                                          = 18.062×$10^{23}$

(2) For molecules:-

The molar mass of SO$_{2}$ = 32+ 16+ 16

                                       = 64g/mol

we know,   no. of moles = $\frac{given mass}{molar mass}$

no.of moles of SO$_{2}$ = $\frac{0.3}{64}$ = 0.0046 mol

1 mole of any substance contains Avogadro's number of molecules= 6.022×$10^{23}$

thus, the no. of molecules of SO$_{2}$ present in 0.3g = 0.0046× 6.022×$10^{23}$

                                                                                  = 0.0277 ×$10^{23}$