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1) Please could you help me answering these questions step by step Determine the solubility (M)...

1) Please could you help me answering these questions step by step
Determine the solubility (M) of oxygen in water at 25 ° C and at a partial pressure of 190 Torr. KO2 = 3.30x107 Torr. Tip: Approximate the number of total moles to the number of moles of water. Answer = 3.2 x 10-4 M

2) Calculate the ideal solubility in molar fraction of benzoic acid at 25 ° C. the melting point of benzoic acid is 122 ° C and the heat of fusion is 4139 cal / mol.

Answer: 0.18

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