Is a second-order reaction with a rate constant of 1.6 x 10⁻³ at 700°C. If 0.250 mol of HI is placed in a 1L container at 700°C, how many moles of HI will remain in the container after 2 hours?
a) 0.040 mol
b) 0.050 mol
c) 0.060 mol
d) 0.070 mol