215. The table below shows the experimental data on the adsorption of krypton on silica gel at a liquid nitrogen temperature of 77.8 K. Calculate the specific surface area of the sample using the BET method, assuming a krypton landing site of 21.5 Å2.

p/pS 0.00058 0.0109 0.089 0.208 0.249 0.335
n, µmol/g 66 182 357 482 515 573

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