Kagi98JP Posted June 22, 2021 Share Posted June 22, 2021 Hello everyone! I have been tasked with creating a airbag from a plastic sandwich bag, acetic acid, and sodium bicarbonate. The volume of my sandwich bag is 0.87 L, the pressure in my area is 100.6 kPa, and the temperature in the room is 295.15 K. First, I am tasked to find the mass of NaHCO3 needed. My calculations are as follows: n = PV / RT n = (100.6 kPa)(0.87 L) / (8.314 kPa x L / mol x K)(295.15 K) n = 0.03566682292 mol NaHCO3 M = 75.028 g/mol m = n x M m = 2.676 = 2.7 g Now, I need to calculate the volume of acetic acid, but I run into a roadblock: nHC2H3O2 = (0.03566682292 mol NaHCO3)(1 mol HC2H3O2 / 1 mol NaHCO3) nHC2H3O2 = 0.03566682292 mol V = nRT / P V = (0.03566682292 mol)(8.314 kPa x L / mol x K)(295.15 K) / 100.6 kPa V = 0.8666 = 0.87 L Huh? I doubt I need to fill the bag completely full with acetic acid to produce a reaction. What have I done wrong here? Thank you so much for the help! Link to comment Share on other sites More sharing options...
Sensei Posted June 22, 2021 Share Posted June 22, 2021 2 hours ago, Kagi98JP said: V = nRT / P V = (0.03566682292 mol)(8.314 kPa x L / mol x K)(295.15 K) / 100.6 kPa V = 0.8666 = 0.87 L Huh? I doubt I need to fill the bag completely full with acetic acid to produce a reaction. What have I done wrong here? Thank you so much for the help! Volume of acetic acid which is in liquid/solid state not gaseous state.. 1 Link to comment Share on other sites More sharing options...
Kagi98JP Posted June 22, 2021 Author Share Posted June 22, 2021 24 minutes ago, Sensei said: Volume of acetic acid which is in liquid/solid state not gaseous state.. Of course. You're absolutely right. Thanks so much! 1 Link to comment Share on other sites More sharing options...
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