Q2 part1. Hydrogen gas can be readily prepared by reacting zinc metal with hydrochloric acid: Zn(s)...
Q2
part1.
Hydrogen gas can be readily prepared by reacting zinc metal with hydrochloric acid: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
A sample of zinc metal was decomposed in hydrochloric acid and
the hydrogen gas was collected over water. The volume of gas
collected is 0.798 L at 25oC and a total pressure of 735
torr.
How many grams of zinc were decomposed assuming there is an excess
of hydrochloric acid? [Hint: the vapor pressure of water at 25oC
can be obtained in Appendix B.]
part 2
B) An unknown gas effuses at a rate that is 1.08 times that of argon at the same temperature. Calculate the molar mass of the unknown gas.
Homework Answers
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Q2
part1.
Hydrogen gas can be readily prepared by reacting zinc metal with
hydrochloric acid: Zn(s)...
Hydrogen gas is produced by the reaction of hydrochloric acid, HCl, on zinc metal. 2HCl (aq)...
Hydrogen gas is produced by the reaction of hydrochloric acid, HCl, on zinc metal. 2HCl (aq) + Zn (s) --> ZnCl2 (aq) + H2 (g) The gas is collected over water. If 106 mL of gas is collected at 28C and 775 mmHg, what is the mass of hydrogen collected? (vapor pressure of water at 28C is 25.6 mmHg)
zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation:...
zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation: Zn(s) + 2HCl(aq)ZnCl2(aq) + H2(g) The product gas, H2, is collected over water at a temperature of 20 °C and a pressure of 745 mm Hg. If the wet H2 gas formed occupies a volume of 9.32 L, the number of moles of Zn reacted was __mol. The vapor pressure of water is 17.5 mm Hg at 20 °C.
When 0.40 g of impure zinc reacted with excess hydrochloric acid, 127mL of hydrogen gas were...
When 0.40 g of impure zinc reacted with excess hydrochloric acid, 127mL of hydrogen gas were collected over water at 10 degrees C at a total pressure of 737.77 Torr. The vapor pressure of water at 10 degrees C is 9.21 Torr. The reaction in question is: Zn (s) + 2HCl (aq) --> ZnCl2 (aq) + H2 (aq) A.) what amount (in grams) of H2 gas was collected? B.) what is the percentage of purity of the zinc, assuming that...
Hydrogen gas is produced by the reaction of hydrochloric acid on zinc metal: Zn (s) +...
Hydrogen gas is produced by the reaction of hydrochloric acid on zinc metal: Zn (s) + HCl (aq) --> ZnCl (aq) + H2 (g) If 155ml of gas was collected at 26℃ and the total pressure was 1.12 bar how many milli-moles (mmol) of hydrogen was produced? Vapour pressure of water at 26℃: 0.0233 barr, R = 0.08314 L*bar/mol*K MM's: Zn = 65.39 g/mol, H = 1.008 g/mol, Cl = 35.35g/mol
Hydrogen gas was produced by reacting 0.976 g of zinc metal with excess hydrochloric acid. Write...
Hydrogen gas was produced by reacting 0.976 g of zinc metal with excess hydrochloric acid. Write a balanced reaction equation (include states). If 376 mL of hydrogen gas is collected over water at 25 °C at a total pressure of 751 mm Hg, what was the experimental molar mass of Zn? 1. Write a balanced reaction equation (include states). 2. What was the experimental molar mass of Zn? Answer to the correct number of significant figures. 3. Calculate the %...
A sample of zinc metal is allowed to react completely with an excess of hydrochloric acid:...
A sample of zinc metal is allowed to react completely with an excess of hydrochloric acid: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(8) look GO The hydrogen gas produced is collected over water at 25.0°C. The volume of the gas is 8.90 L, and the atmospheric pressure is 0.951 atm. Calculate the amount of zinc metal in grams consumed in the reaction. rint rences (Vapor pressure of water at 25°C = 23.8 mmHg.) gZn
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#1. Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure at 18.4 °C is 59.7 torr. The volume of the mixture is 7.7 L and its total pressure is 0.86 atm. Determine the partial pressure of the hydrogen gas in this mixture. Respond with the pressure to the nearest tenth of a torr. #2. Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over...
Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H2SO4(aq) → Zn...
Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H2SO4(aq) → Zn (aq) + H2 (g) In an experiment, 177 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 766 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is ________ atm.
Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation:...
Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation: Zn(s)+ 2HCIaq) ZnCh(aq)+H() The product gas, He, is collected over water at a temperature of 20 °C and a pressure of 760 mm Hg. If the wet H gas formed occupies a volume of 7.53 L, the number of moles of Zn reacted was Hg at 20 °c mol. The vapor pressure of water is 17.5 mm
Zinc reacts with hydrochloric acid to form hydrogen gas. A 0.258 g sample of Zinc reacts...
Zinc reacts with hydrochloric acid to form hydrogen gas. A 0.258 g sample of Zinc reacts with 25.0 mL of 0.250 M HCI solution. What volume does the hydrogen has formed occupy at 24.0 °C and 0.990 atm? Zn(s) + 2HCl(aq) --ZnCl2(aq) + H2(g) 33.0 mL 97.3 mL 6.21 mL 77.0 mL
A sample of zinc metal is allowed to react completely with an excess of hydrochloric acid: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(8) look GO The hydrogen gas produced is collected over water at 25.0°C. The volume of the gas is 8.90 L, and the atmospheric pressure is 0.951 atm. Calculate the amount of zinc metal in grams consumed in the reaction. rint rences (Vapor pressure of water at 25°C = 23.8 mmHg.) gZn
Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas according to the following equation: Zn(s)+ 2HCIaq) ZnCh(aq)+H() The product gas, He, is collected over water at a temperature of 20 °C and a pressure of 760 mm Hg. If the wet H gas formed occupies a volume of 7.53 L, the number of moles of Zn reacted was Hg at 20 °c mol. The vapor pressure of water is 17.5 mm
Zinc reacts with hydrochloric acid to form hydrogen gas. A 0.258 g sample of Zinc reacts with 25.0 mL of 0.250 M HCI solution. What volume does the hydrogen has formed occupy at 24.0 °C and 0.990 atm? Zn(s) + 2HCl(aq) --ZnCl2(aq) + H2(g) 33.0 mL 97.3 mL 6.21 mL 77.0 mL
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