Hydrogen and Balanced Chemical Equation
Determine Value of R Lab 3 Report must be typed and submitted to Turn it in by Wednesday Sept 24th 11:59pm.
Title +1
Purpose +1
Procedure +2
Data Table +4x
Balanced Chemical Equation +2
Calculations
Calculate R for each trial and then average. +5
Calculate % error +2
Type and Answer Discussion Questions +8
Additional Questions for Calculating the R Lab
1. One mole of hydrogen gas has a mass of 2.02 g. Use your value of molar volume to calculate the mass of one Liter of hydrogen gas at STP. The density is in g/L. Compare your value to a literature value? (Consult a hand book or text book)
2. In setting up this experiment, a student noticed that a bubble of air leaked into the gas tube when it was inverted in the water bath. What effect would this have on the measured volume of hydrogen gas? Would the calculate value be too high or too low as a result of this error? Explain
3.A student noticed that the magnesium ribbon appeared to be oxidized, the metal surface was black and dull not silver and shiny. What effect would this have on the measured mass of Mg? Would the calculate value be too high or too low as a result of this error? Explain
4.A student noticed that the balance has been incorrectly tarred (zeroed) after she was finished performing the experiment. Instead of reading zero the balance was reading a negative value. What effect would this have on the measured mass of Mg? Would the calculate value be too high or too low as a result of this error? Explain
25 POINTS TOTAL
Title +1
Purpose +1
Procedure +2
Data Table +4x
Balanced Chemical Equation +2
Calculations
Calculate R for each trial and then average. +5
Calculate % error +2
Type and Answer Discussion Questions +8
Additional Questions for Calculating the R Lab
1. One mole of hydrogen gas has a mass of 2.02 g. Use your value of molar volume to calculate the mass of one Liter of hydrogen gas at STP. The density is in g/L. Compare your value to a literature value? (Consult a hand book or text book)
2. In setting up this experiment, a student noticed that a bubble of air leaked into the gas tube when it was inverted in the water bath. What effect would this have on the measured volume of hydrogen gas? Would the calculate value be too high or too low as a result of this error? Explain
3.A student noticed that the magnesium ribbon appeared to be oxidized, the metal surface was black and dull not silver and shiny. What effect would this have on the measured mass of Mg? Would the calculate value be too high or too low as a result of this error? Explain
4.A student noticed that the balance has been incorrectly tarred (zeroed) after she was finished performing the experiment. Instead of reading zero the balance was reading a negative value. What effect would this have on the measured mass of Mg? Would the calculate value be too high or too low as a result of this error? Explain
25 POINTS TOTAL