Question

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)

Answer 1

• No of atoms=2×10^21

No of moles:-

`\\ \sf\longmapsto (2* 10^(21))/(6.022* 10^(22))`

`\\ \sf\longmapsto 0.3* 10^(-1)mol`

`\\ \sf\longmapsto 0.03mol`

Now

0.03mol of element weigh 0.4g

1mol of element weigh:-

`\\ \sf\longmapsto (0.4)/(0.03)`

`\\ \sf\longmapsto 13.3g`

Now

0.5mol of element weigh:-

`\\ \sf\longmapsto 13.3(0.5)=6.65g`