Which of the following deviations from the experiment could cause a decrease in the calculated mass of Mg(s)? a. Incorrectly recording the barometric pressure. b. Using a beaker with a wider diameter. c. Using a eudiometer of different length. d. Not accounting for the vapor pressure of water. Which of the following deviations from the experiment would most considerably cause an increase in the final calculated %yield of the Mg(s)? a. Placing 13.0 mL instead of 10.0 mL of 6.0 M HCI into the eudiometer. b. Immediately reading the volume of gas right after the reaction ceased. Not adding enough water to fill the eudiometer to the brim, leaving a headspace after inverting the eudiometer. С. d. Consciously inserting 15.0 mg of folded Mg ribbon instead of the prescribed 20 to 30 mg into the eudiometer. Which of the following correctly explains why the vapor pressure of water has to be included in the calculations? a. As the H2(g) is bubbled up the reaction solution, some of the H2(g) molecules are solubilized by water in the aqueous solution, effectively decreasing the measured pressure above. b. The pressure exerted by the evolved H2(g) is reduced because of the co-presence of water vapor, thus Pwater Some of the liquid water evaporates into the gas, and increases the total pressure generated by the trapped gas. d. The pressure contributed by the H2(g) is greater than the measured total pressure because of the contribution of partial pressure of water vapor. has to be added to Pdry gas. vapor С. Recap of the Experiment Record Volume of the Place 10.0 Cover the enclosed gas, the height difference Insert folded mL of 6.0 M mouth of the Mg ribbon (approx. 0.02-0.03 g) Add water HCI into a eudiometer with to fill between the water finger and invert into a glass that is 2/3 filled w/ eudiometer eudiometer levels inside and partially filled w/ distilled to the brim. into the outside the eudiometer, eudiometer. and the temperature of water. water. the water outside.

Which of the following deviations from the experiment could cause a decrease in the calculated mass of Mg(s)? a. Incorrectly recording the barometric pressure. b. Using a beaker with a wider diameter. c. Using a eudiometer of different length. d. Not accounting for the vapor pressure of water. Which of the following deviations from the experiment would most considerably cause an increase in the final calculated %yield of the Mg(s)? a. Placing 13.0 mL instead of 10.0 mL of 6.0 M HCI into the eudiometer. b. Immediately reading the volume of gas right after the reaction ceased. Not adding enough water to fill the eudiometer to the brim, leaving a headspace after inverting the eudiometer. С. d. Consciously inserting 15.0 mg of folded Mg ribbon instead of the prescribed 20 to 30 mg into the eudiometer. Which of the following correctly explains why the vapor pressure of water has to be included in the calculations? a. As the H2(g) is bubbled up the reaction solution, some of the H2(g) molecules are solubilized by water in the aqueous solution, effectively decreasing the measured pressure above. b. The pressure exerted by the evolved H2(g) is reduced because of the co-presence of water vapor, thus Pwater Some of the liquid water evaporates into the gas, and increases the total pressure generated by the trapped gas. d. The pressure contributed by the H2(g) is greater than the measured total pressure because of the contribution of partial pressure of water vapor. has to be added to Pdry gas. vapor С. Recap of the Experiment Record Volume of the Place 10.0 Cover the enclosed gas, the height difference Insert folded mL of 6.0 M mouth of the Mg ribbon (approx. 0.02-0.03 g) Add water HCI into a eudiometer with to fill between the water finger and invert into a glass that is 2/3 filled w/ eudiometer eudiometer levels inside and partially filled w/ distilled to the brim. into the outside the eudiometer, eudiometer. and the temperature of water. water. the water outside.

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter9: Gases

Section: Chapter Questions

Problem 67E: The chlorofluorocarbon CCl2F2 can be recycled into a different compound by reaction with hydrogen to...

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