- ✓$K = \frac{1}{t}\,\ln \,\left[ {\frac{{2{P_0}}}{{3{P_0} - Pt}}} \right]$
- B$K = \frac{1}{t}\,\ln \,\left[ {\frac{{{P_0}}}{{3{P_0} - Pt}}} \right]$
- C$K = \frac{1}{t}\,\ln \,\left[ {\frac{{2{P_0}}}{{{P_0} - Pt}}} \right]$
- D$K = \frac{1}{t}\,\ln \,\left[ {\frac{{{P_0}}}{{2{P_0} - Pt}}} \right]$
