In a reacting flask, 500 cm3 hydrogen is mixed with 500 cm3 oxygen and is ignited. (a) Which reactant is the limiting reagent? (b) Calculate the mass of water formed.

See Explanation

Explanation:

From Gay-Lussac's law of combining volumes;

Equation of the reaction; 2H2(g)  + O2(g) > 2H2O(g)

Ratio of volumes;              2           :    1                :    2

Initial volumes;                  500cm^3   500cm^3       0 cm^3

Reacting volumes;          500cm^3    250cm^3      500cm^3

Final Volumes;                0 cm^3        250 cm^3     500 cm^3

We can easily see from the table that the limiting reactant is oxygen.

Hence, the mass of water formed is obtained from;

1 mole of gaseous water occupies 22400 cm^3

x moles of water occupies 500cm^3

x = 500cm^3 * 1 mole/22400 cm^3

x = 0.022 moles of water

Mass of water = 0.022 moles of water * 18 g/mol

Mass of water = 0.396 g

im pretty sure its b

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms