For the following problem, you may either type in your work and answers or upload an image or pdf clearly showing your work and answers. 1) Determine whether each of the errors listed below would make the value of the gas constant, R: Lower (L), Higher (H), Cause no change (NC). (Hint: Follow a complete set -up for the calculation of R to see the effect of each error.)a) Zn (s) contains contaminants that are insoluble in HCl solution. R=P∗Vn∗T a) ____________ b) Zinc (s) is contaminated with Al (s). (Hint; Write a balanced chemical equation for the reaction of Al(s) with HCl (aq).) b) _____________ c) H2 gas is soluble in water . c) ____________ d) Suppose you did not take into consideration the height of the water column inside the gas collecting tube, but assumed the pressure inside the gas collecting tube equaled the atmospheric pressure.
For the following problem, you may either type in your work and answers or upload an image or pdf clearly showing your work and answers.
1) Determine whether each of the errors listed below would make the value of the gas constant, R: Lower (L), Higher (H), Cause no change (NC).
(Hint: Follow a complete set -up for the calculation of R to see the effect of each error.)a) Zn (s) contains contaminants that are insoluble in HCl solution. R=P∗Vn∗T
a) ____________
b) Zinc (s) is contaminated with Al (s).
(Hint; Write a balanced chemical equation for the reaction of Al(s) with HCl (aq).)
b) _____________
c) H2 gas is soluble in water .
c) ____________
d) Suppose you did not take into consideration the height of the water column inside the gas collecting tube, but assumed the pressure inside the gas collecting tube equaled the atmospheric pressure.
d) ____________
e) If the air bubbles are not expelled from the inverted gas collecting tube prior to the generation of H2 (g).
e) _____________
2) A 0.0677 g sample of magnesium metal reacted with excess hydrochloric acid to produce 69.9 ml of hydrogen gas. The gas was collected over water at 21.0 °C. The levels of water inside and outside the gas collecting tube are identical. The water vapor pressure at 21.0 °C is 18.6 mm Hg and the atmospheric pressure is 755 mm Hg. Calculate the experimental molar volume of hydrogen gas at STP. (You must write a balanced chemical equation for the reaction)
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Answer______________
3) A 0.188 g sample of unknown metal,X (s), produced 71.4 ml of hydrogen gas when reacted with HCl according to the equation:
X (s) + 2 HCl (aq) --> XCl2 (aq) + H2 (g)
The gas was collected over water at 23 ° C. The levels of water inside and outside the gas collecting tube are identical. The vapor pressure of water at 23 ° C is 21.1 mm Hg and the atmospheric pressure is 752 mm Hg. Calculate the molar mass of the unknown metal, X. (R =0.0821 L.atm/mol.K)
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