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Determine What is the percent by mass of sodium phosphate in a 0.142M Na3PO4(aq) solution? If it is given that it has a density =1.015g/mol.

Determine concentration of oxygen gas in H2O at the temperature of 25 degrees Celsius exposed to a partial pressure of oxygen =325mmHg? It is given that the Henry's law constant for oxygen gas =1.3 x 10^-3 mol/ L x atm at at 25 degrees Celsius .

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