Q12 of 40 Page 1

An element crystallizes in a f.c.c. lattice with cell edge of 250 pm. Calculate the density if 300 g of this element contain atoms.

Given


a = 250 pm = 250 x 10-12 m


z = 4


m = 300g


We know that,



Where M = Molar mass and NA = 6.022 x 1023


Therefore,


Also,



Therefore, the density is 38.4 g/cm3


More from this chapter

All 40 →
11

Give reasons:

The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.

 11

Give reasons:

reactions are accompanied by racemization in optically active alkyl halides.

 13

The rate constant for the first order decomposition of H2O2 is given by the following equation:


Calculate for this reaction and rate constant k if its half-life period be 200 minutes.


(Given: )

 14

Differentiate between adsorption and absorption.