Mass of copper before electrolysis 5.621 g Mass of copper after electrolysis 5.487 g Volume of H2 collected 53.6 mL Pressure of H2, PH2 727.0 mm Hg Temperature 21.3 oC 1. Determine and report the pressure of collected hydrogen gas in atmospheres. Report this result to one more digit than allowed by applying the rules of significant figures. (1 atm = 760 mm Hg, an exact conversion factor.) 2. Determine the moles of hydrogen collected by substituting the appropriate quantities into the ideal gas equation and solving. Report this result to one more digit than allowed by applying the rules of significant figures. Notes: the gas temperature is the same as the listed temperature; R = 0.082057 L-atm/mol-K. Be mindful of units. 3. Determine the experimental atomic mass of Cu. Round this result to the correct number of significant figures. 4. Determine the percent relative error (= ????????????−?ℎ????????? ?ℎ????????? ? 100). The molar mass of Cu is 63.546 g/mol.
Mass of copper before
Mass of copper after electrolysis 5.487 g
Volume of H2 collected 53.6 mL
Pressure of H2, PH2 727.0 mm Hg
Temperature 21.3 oC
1. Determine and report the pressure of collected hydrogen gas in atmospheres. Report this result to one more digit than allowed by applying the rules of significant figures. (1 atm = 760 mm Hg, an exact conversion factor.)
2. Determine the moles of hydrogen collected by substituting the appropriate quantities into the ideal gas equation and solving. Report this result to one more digit than allowed by applying the rules of significant figures. Notes: the gas temperature is the same as the listed temperature; R = 0.082057 L-atm/mol-K. Be mindful of units.
3. Determine the experimental
4. Determine the percent relative error (= ????????????−?ℎ????????? ?ℎ????????? ? 100). The molar mass of Cu is 63.546 g/mol.
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