Calculate Gas Vol at S.T.P. from 750.0 mmHg, 85.0°C

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To calculate the volume of gas collected at standard temperature and pressure (S.T.P.) from the initial and final water levels in the gas collection tube, the change in volume must first be determined, which is 75.0 ml. The pressure of the gas is given as 750.0 mmHg, and the temperature is 85.0°C, which needs to be converted to Kelvin for calculations. Using the ideal gas law and the formula PV/T = constant, the volume can be adjusted to S.T.P. conditions (0°C and 1 atm). The final volume of the gas at S.T.P. can be calculated by applying the necessary conversions and corrections based on the initial conditions. This method effectively allows for the determination of gas volume under standard conditions.
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A gas collecting tube full of water is inverted in a beaker of water in which a reaction is taking place. The water level in the tube is at 200.0 ml at the beginning of the experiment, and at 125.0 ml, at the end. the pressures is 750.0 mm Hg and the temperature is 85.0 Celsius. Calculate the volume of a gas collected corrected to S.T.P..

This is an review from last year and I can't exactly remember how to solve this.
 
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Ideal gas equation will do. Or PV/T = const.
 

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