please help with bottom question number 2

Date 768 1. barometric pressure ( mmHg ) 2. h value (water height difference) (1mm ) 3. Volume and temperature values Calculations and Data Analysis For all calculations, show the complete method including units in both the set up and answer. Put answers on a separate sheet. 1. Calculate the cylinder pressure. 2. Calculate the moles of air using the low temperature and volume values and the cylinder pressure. Be sure to apply the necessary correction to the volume and to convert all relevant quantities to the proper units