Question

calculate the number of molecules in 8gram of O2

Answer 1

Given mass of oxygen = 8 g

Molar mass of oxygen = 16 g

No. of moles = $\mathsf{{\dfrac{Given \ mass}{Molar \ mass}}}$

No. of moles = $\dfrac{8}{16}$

$\bold{No. \ of \ moles \ = \ 0.5}$

$\bold{Avogadro \ constant \ = \ 6.022 × {10}^{23}}$

No. of molecules = No. of moles × Avogadro constant

= 0.5 × 6.022 × ${10}^{23}$

= $\bold{\underline{1.2044 × {10}^{23}}}$

Answer 2

Given mass of oxygen = 8 g

Molar mass of oxygen = 16 g

NO.of moles = given mass / molar mass

8/16= 0.5

Avagadro constant  =6.022×10^23


No. of molecules = No. of moles × Avogadro constant

= 0.5 × 6.022 × 10^23

= 1.2044 × 10^23

=1.2044×10^23​


THANKS ❤


#Nishu HarYanvi ♥