Length of magnesium ribbon Mass to length ratio of magnesium Mass of magnesium Temperature of the hydrogen gas Barometric pressure Vapor Pressure of water Trial 1 1.9 cm Trial 2 1.0191 cm .07/97 cm 0191 g/cm 0197 g/cm 3743 19.5 °C 803743 20 g °C 736.8 mm Hg 753.8mm Hg Pressure of hydrogen gas in mm Hg (PH2 = Pbar- PH20) 736.8 mm Hg Pressure of hydrogen gas in atmospheres Volume of hydrogen gas in milliliters Volume of hydrogen gas in liters 17 mm Hg 18 mm Hg . 9695 735,8 mm Hg atm 0.9602 atm 37.96 mL 36.67 mL L Moles of hydrogen gas formed (n= PV/RT) Moles of magnesium reacted Molar mass of magnesium Average molar mass of magnesium Post-Lab Questions: 07796 L.06 00153 mole mole 00153 mole 0014 mole 24.464 g/mole 25.76g/mole 24.92013559 g/mole (1) Why does the collected gas have to be transferred to a cylinder full of water and lowered until the water level in the buret is the same as the water level in the cylinder in order to read the volume? (2) Why is the number of moles of hydrogen collected in this experiment equal to the number of moles of magnesium reacted?