6) Hydrogen gas can be generated from the reaction between aluminum metal and hy

Question

6) Hydrogen gas can be generated from the reaction between aluminum metal and hydrochloric acid: 2 Al (s) + 6 HCI (aq) 2 AICI, (aq) + 3H2(g) us Suppose that 3.00 grams of Al are mixed with excess acid. If the hydrogen gas produced is directly collected into a 850. mL glass flask at 24.0 °C, what is the pressure inside the flask (in atm)? a. This hydrogen gas is then completely transferred from the flask to a balloon. To what volume (in L) will the balloon inflate under STP conditions? b. e. Suppose the balloon is released and rises up to an altitude where the temperature is 11.2 C and the pressure is 438 mm Hg. What is the new volume of the balloon (in L)? 109 Page 3 of 3

Explanation / Answer

6) no of mol of Al = 3/27 = 0.11 mol

   2 mol Al = 3 mol H2

   no of mol of H2 produced = 0.11*3/2 = 0.165 mol

pressure of gas (P) = nRT/V

         = 0.165*0.0821*297/0.85

   = 4.733 atm

b) P1V1/T1 = P2V2/T2 (stp)

    (4.733*0.85/297) = (1*V2/273.15)

v2 = Volume of ballon = 3.7 L

c) P2 = 438/760 = 0.58 atm

     T2 = 11.2 C +273.15 = 284.35 k

      v2 = ?

P1V1/T1 = P2V2/T2

(1*3.7/273.15) = (0.58*v2/284.35)

v2 = new volume of ballon = 6.64 L

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