i. State the type of isotherm in the following figure. ii. Explain this type of isotherm. iii. Write down the BET-surface area equation iv. At what relative pressure we can calculate the total pore volume? 700 600 500 400 300 200 Amount Adsorbed (cm STP/g) 100 0 0.0 MCM-41 0.2 4.6 nm 5.8 nm 5.5 nm 6.5 nm 0.4 0.6 Relative Pressure 0.8 1.0