SAT Subject Test Chemistry,10 edition

8 . A   50  g   sample  of  metal   was heated  to  100°C   and then    dropped into    a   beaker  containing  50

g   of  water   at  25°C.   If  the specific    heat    capacity    of  the metal   is  0.25    cal/g   •   °C, what    is  the

final   temperature of  the water?

(A) 27°C

(B) 40°C

(C) 60°C

(D) 86°C

9 . Calculate   the maximum amount  of  work    that    can be  done    by  the following   reaction    at

30°C:

(ΔH =   −125    kJ, ΔS  =   −200    J/K)

FeCl 2  (aq)    +   1/2 Cl 2    (g) →   FeCl 3   (aq)

(A) 64.4    kJ

(B) 119 kJ

(C) 5875    kJ

(D) 60,475  kJ

10 . Calculate the bond energy of a BrF bond using the following reaction equation. (ΔHf of
BrF 5 (g) = −429 kJ/mol, ΔHf of Br (g) = 112 kJ/mol, ΔHf of F (g) = 79 kJ/mol)

Br  (g) +   5F  (g) →   BrF 5    (g)

(A) 936 kJ/mol

(B) 187 kJ/mol

(C) 86  kJ/mol

(D) 47  kJ/mol