contestada

can anyone with steps

Mass of 2x10^21 number of atom of a element is 0.4g. What is the mass of 0.5 mol of the element . (Ans:- 602.2g)

Respuesta :

  • No of atoms=2×10^21

No of moles:-

[tex]\\ \sf\longmapsto \dfrac{2\times 10^{21}}{6.022\times 10^{22}}[/tex]

[tex]\\ \sf\longmapsto 0.3\times 10^{-1}mol[/tex]

[tex]\\ \sf\longmapsto 0.03mol[/tex]

Now

0.03mol of element weigh 0.4g

1mol of element weigh:-

[tex]\\ \sf\longmapsto \dfrac{0.4}{0.03}[/tex]

[tex]\\ \sf\longmapsto 13.3g[/tex]

Now

0.5mol of element weigh:-

[tex]\\ \sf\longmapsto 13.3(0.5)=6.65g[/tex]