288 Answers
- MT = 13000 (suggesting surface dissociation)
- wA = 2RT (suggesting that hydrogen is dissociated into atoms
when chemisorbed on a nickel surface) - Vm = 225 cm^3 (s.t.p.) g'^1
a = 7.1 x Hr^5 Pa~l - 530 m^2 g"^1
- 47 x 10"^20 m^2
- 7.8 m^2 g"^1 (using BET equation)
- V/Vm 0.4 0.8 1.2
A//ads/kJ moP^1 -11.8 -12.7 -9.1
Values reflect multilayer physical adsorption on a fairly uniform
solid surface - 0 = 0.1, A#ads = -180 kJ mol~ l
0 = 0.5, A//ads. = -123 kJ
Absolute magnitudes suggest chemisorption and relative magni-
tudes reflect preferential adsorption at the more active sites on
the solid surface - A/fad,. = -44 kJ moP^1
- r = 2.03 nm (assuming zero contact angle, closed cylindrical
pores, constancy of y with r, equivalence of multilayer adsorption at
flat and curved surfaces) - (a) p/p 0 = 0.81; (b) plp 0 = 0.90
- Fe(lOO), 12.2 x 1014 atoms cm"^2 ;
Fe(llO), 17.3 x 1014 atoms cnT^2 ;
Fe(lll), 7.1 x 1014 atoms cm"^2 ;
Fe(100)-C(2 x 2)-N, 6.1 x 1014 N atoms cm~^2 - Wa - 54.0 ml m~^2 , S = -91.5 mJ m~^2
- 69°
- 145 x 10"^20 m^2
- (a) 1 nm; (b) 10 nm; (c) 7 nm; (d) 5 nm