Asked by Kalli Simpson

For the reaction 2 Na + 2 H2O -------> 2 NaOH + H2, how many grams of hydrogen gas are produced when 133.6 g of water are reacted?

I am soooo confused in chemistry. Please help.
Answered by MathMate
First calculate molecular masses of
M<sub>H2</sub> = (2*1.008) and
M<sub>H2O</sub> = (2*1.008+15.999)

Then
mass of hydrogen produced
=mass of water *(M<sub>H2</sub>/(2M<sub>H2O</sub>))

Note the factor 2 in the denominator comes from the stoichiometric coefficient of H2O.


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