In reaction 3, 5.7 mL of 8.1 M NaOH reacts with excess HCl. From the temperature curve, the temperature change is 7°C. Calculate the calorimeter's specific heat capacity.
a) 0.52 J/g°C
b) 1.21 J/g°C
c) 2.85 J/g°C
d) 4.67 J/g°C