Concentration (mol dm-³) 0.5- 0.4- 0.3- 0.2- 0.1 2. 3 5 The following equilibrium reaction is given: 2HI(g) = H₂(g) + I₂(g) Time (s) H₂/ HI Cy A change in pressure will not affect equilibrium in this case as the number of moles of gas is the same on both sides of the equation. AH> 0 A graph plotting the concentrations of the substances present versus time is given in Figure 7.10. a) b) Explain the physical situation in the container from t=0 s to t = 5 s. Which external factor was altered in order to bring about a change in the shape of the graph at t = 5 s? Explain. Calculate Kat t = 3 s. 1 dm³ COCI, decomposes​