A hydrogen-filled balloon was ignited and 1.60g of hydrogen reacted with 12.8g of oxygen.How many grams of water vapor were formed? (Assume that water vapor is the only product.)

Question

aaronq · Answer

for problems involving stoichiometry, you have to convert whatever information they give you to moles (signified by the symbol "n")

Use the stoichiometric coefficients to build a ratio, like this:

e.g. for a general reaction:

                      $\color{red}{a}A + \color{blue}{b}B$ $\rightleftharpoons$ $ \color{green}{c}C$

where upper case are the species (A,B,C), and lower case (a,b,c) are the coefficients (in red),

                     $\dfrac{n_A}{\color{red}{a}}=\dfrac{n_B}{\color{blue}{b}}=\dfrac{n_C}{\color{green}{c}}$

from here, you can solve for moles then convert to grams.

To convert mass to moles, use the relationship:

                             $n=\dfrac{m}{M}$

        where, M=molar mass, m=mass, and n= moles.


But, first you need to write and balance the reaction taking place.