Question

Date Post-Lab Questions If your partner did not take into account the vapor pressure of water when calculating the moles of hydrogen produced, would the mass of Mg that was calculated at the end of the experiment be too high or too low? nced haf t ribbon are coated with white MgO, would this cause the mass of Mg that you calculate to be too high or too low? Why? 3. Instead of a strip of pure Mg nibbon, you are accidentally given a strip of an aluminum-magnesium alloy chemical equations (one equation for the reaction of Mg with HCI and You calculate the mass of the strip as above. Would the mass of the strip be high or lower than another equation for the reaction of Al with HC1) and explain your answer. heed hefp wi ths Page 3 BOOK the reaction s ume: Date: 7. Record the barometric pressure 8. Repeat this experiment with the second piece of magnesium rblbon 9 Untwist the wire from the piece of fiberglass. Rinse the wire, fsberglass square, and stopper, place them n the container, and return the container to the instuctor's desk The table of temperature/vapor pressure of water is in your textbook and in the back of your laboratory manual. The density of meroury is 13.6 gml. Data Sheet Unknown Number Volume of Ha gas (ml Temperature of water C) Height of water column (mm vapor pressure of water at above temperature (mmHg) Barometric pressure (mmHg) Sample 1 Sample 2 602-28601 972 as 1a5 125 Calculations (Show calculations) Pressure of the column of water (mmHg) Pressure of dry hydrogen (mmHg) Moles of Hydrogen Mass of Magnesium ribbon (g) Average mass of magnesium ribbon (g) 17 14.5 20 emperaturero Pressure (mm Ha) 18 15.51 30 31.8 26 27 29 Temperature ("C) Pressure (mm Hg) 24 224 25 23.8 Page 2 o 751.078 m

Answer 1

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