A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8g cm^(-3) , then the number of atoms present in 256 g of the crystal isN xx 10^(24). The value of N is

A crystalline solid of a pure substance has a face-centred cubic struc

1.	A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8g cm^(-3) , then the number of atoms present in 256 g of the crystal isN xx 10^(24). The value of N is
Answer» <html><body><p><br/></p>Solution :`p ( Z <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> M)/( a^(3) xx N_(0) xx 10^(-30)` <br/>Where a is in pm and M in g ` Mol^(-1)`<br/>` 8 = ( 4 xx M)/((400)^(3) xx 6 xx 10^(23) xx 10^(-30))) <a href="https://interviewquestions.tuteehub.com/tag/orm-11673" style="font-weight:bold;" target="_blank" title="Click to know more about ORM">ORM</a> = 76.8` <br/>Moles in <a href="https://interviewquestions.tuteehub.com/tag/256-297976" style="font-weight:bold;" target="_blank" title="Click to know more about 256">256</a> g = ` 256/76.8 = 3.33` <br/> No, of <a href="https://interviewquestions.tuteehub.com/tag/atoms-887421" style="font-weight:bold;" target="_blank" title="Click to know more about ATOMS">ATOMS</a>= ` 3.33 xx 6 xx 10^(23)`<br/>`= <a href="https://interviewquestions.tuteehub.com/tag/2xx-1840186" style="font-weight:bold;" target="_blank" title="Click to know more about 2XX">2XX</a> 10^(24)`</body></html>