AAMC #24 chem question

[NotShorty]

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I got this test from a guy I met at the bookstore, so I don't have the solution, and I can't figure it out:

Na2CO3+ 2HCl -> CO2 + H2O + 2NaCl

How many mL of a 2M solution of Na2CO3 are required to produce 11.2 L of CO2 at STP? (answer is 250mL)

I'm guessing it's an Ideal Gas question (PV=nRT) but I can't quite figure it out, especially w/o a calc and with time constraint...

Thanks!!!

 

[dxw]

I think this is the one where you had to know that one mole of an ideal gas occupies 22.4L.

 

[PhatGtDmB]

I got this test from a guy I met at the bookstore, so I don't have the solution, and I can't figure it out:

Na2CO3+ 2HCl -> CO2 + H2O + 2NaCl

How many mL of a 2M solution of Na2CO3 are required to produce 11.2 L of CO2 at STP? (answer is 250mL)

I'm guessing it's an Ideal Gas question (PV=nRT) but I can't quite figure it out, especially w/o a calc and with time constraint...

Thanks!!!



Aight man.....Na2CO3 and CO2 are in 1:1 ratio in the equation so if you want 11.2 L of CO2, which is .5 moles (11.2/22.4 (1 mole of gas occupies 22.4L at STP). so .5 moles / (2 moles/L) = .250 L or 250 ml i hope that helps bud