Question

What is the vapor pressure of water at 100 degree C (at sea level)? What unit cells comprise crystalline solids? What are the type of crystal wee Vo solids and differentiate between them type of packing arrangements do they form? How many atoms exist in these packing structures? show The vapor pressure of water at 25 degree C is 23.8 torr, and the heat of evaporation of water vapor pressure of water at 50 degree C. Silver metal crystallizes in a cubic closest packed structure, the radius of a silver atom is 144 pm. calculate the density of the silver metal.

Answer 1

13

answer : 760 mmHg at 100°C. For water,

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16. Silver crystallizes in a cubic closest packed structure. The radius of Ag atom is 1.44 Å (144 pm). Calculate the density of solid silver.

Density =m/v

Diagonal =r+2r+r= 4r

cell is face-centered.

d² + d² = (4r)²

2d² =16 r²

d = sqrt of 8 r²

= r sqrt of 8

where r = the radius

r= 144 pm

d= = 144 sqrt of 8   =407 pm

volume = d^3= (407 pm)^3 =6.74 x10 ^7 pm^3

cubic centimetres =6.74 x10 ^7 pm^3 x (1 x10^-10 cm /pm)^3

= 6.74 x10 ^7 cm^23

Density =m/v

Plugging values in above equations

= (4 atoms ) (107.9 g/mol)(1 mol/6.023 x10623 atoms) /6.74 x10 ^7 cm^23

=10 .6 g/cm^3------answer