Chemical BondingEasy
Question
For the hypothetical reaction
A2(g) + B2(g) ⇋ 2AB(g)
ᐃrGo and ᐃrSo are 20 kJ/mol and -20Jk-1 mol-1 respectively at 200K.
If ᐃrCp is 20 JK-1 mol-1 then ᐃrHo at 400 K is:-
A2(g) + B2(g) ⇋ 2AB(g)
ᐃrGo and ᐃrSo are 20 kJ/mol and -20Jk-1 mol-1 respectively at 200K.
If ᐃrCp is 20 JK-1 mol-1 then ᐃrHo at 400 K is:-
Options
A.20 kJ/mol
B.7.98 kJ/mol
C.28 kJ/mol
D.16 kJ/mol
Solution
ᐃG = ᐃH - TᐃS
⇒ ᐃH = 16 KJ/mol at = 200 K
ᐃH2 - ᐃH1 = ᐃCp (T2 - T1)
⇒ ᐃH400 = 16 + 4 = 20 KJ/mol
⇒ ᐃH = 16 KJ/mol at = 200 K
ᐃH2 - ᐃH1 = ᐃCp (T2 - T1)
⇒ ᐃH400 = 16 + 4 = 20 KJ/mol
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