How do you know how much gas is generated

[jsmith1]

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H2 (g) + Br2 (l) --> 2HBr (g)

If reactions go 100% in the given direction:

If you started with 1 atm of Hbr(g) how much H2(g) would be produced?

What if you started with 1 atm of H2(g) then how much Hbr would be produced in atm?

How do you figure these types of questions out??

 

[ClemsonFirst]

If the reaction only progresses towards HBr, and you begin with HBr in, then you will get no change because there is no reaction pathway for the HBr to change.

If you begin with H2, then we will have change. All you have to do is stoichiometric conversions. So, we 1 atm of H2. using the chemical equation, we know there is a ratio of 2 HBr created for every 1 H2 used in the reaction. We just multiply the amount of H2 we have by the ratio with the reactant (H2) in the bottom.

amount of H2 * (HBr/H2) = amount of HBr

1 * (2/1) = 2 HBr.