Question

please show all work, no cursive.

math work should be in dimensional analysis and use starting amount and make sure each number has its units so that I can understand how to do this.

5) Aluminum reacts with hydrochloric acid to produce hydrogen gas according to the equation below. 2 Al(s) + 6 HCl (aq) + 2 H2 (g) + 3 AlCl3 (aq) a. Balance the equation. (2 pts) b. What volume of hydrogen gas (in mL) is produced when 6.78 grams of aluminum is reacted with excess hydrochloric acid at STP? (5 pts) Ans: c. What volume of hydrogen gas (in ml) is produced when 7.89 grams of aluminum is reacted with excess hydrochloric acid if the pressure is 745 mm Hg and the temperature is 22.5°C? (7 pts)

Answer 1

5) a) Bilanced equation can be written as; 2A115) + 6H Člani 3H2(g) + 2AlCl3 (29) tb) Moles of A1 mass. 6.78. = 0.25 Molar mass 27 According to Stoichiometry; Moles of H₂ gas 3 X males of AI 2. 3 X 0.25 0.38 moles u 2 27 At S.TP volume of Imole gas = 22.4 L so, volume of Hi gas produced 003 8 X 22. 4 m 8.44 L Ang (0) Moles of AL= 7.89 = 0.29 so, moles of the preoduced = 2X0.29 x 0.295 Oyy moles Given: Pressure (P) = 745 atm Temp. (T) 22.5 c = 220 5 +273 = 295.5k from ideal gas equation; Volume of He gas V = nRT 0:44. X :0.1821 x 29555 X 760 P 745 2 V = 10.89 ~ 10.90 L 745mm Hg 760