Question #670ca

1 Answer
Jul 5, 2017


#"2 moles N"_2#


The decomposition of sodium azide to sodium metal and nitrogen gas can be described by the following balanced chemical equation

#color(blue)(2)"NaN"_ (3(s)) stackrel(color(white)(acolor(red)(Delta)aaa))(->) 2"Na"_ ((s)) + color(green)(3)"N"_ (2(g)) uarr#

Notice that for every #color(blue)(2)# moles of sodium azide that undergo decomposition, you get #color(green)(3)# moles of nitrogen gas.

This means that your reaction will produce

#1 color(red)(cancel(color(black)("mole NaN"_3))) * (color(green)(3)color(white)(.)"moles N"_2)/(color(blue)(2)color(red)(cancel(color(black)("mole NaN"_3)))) = "1.5 moles N"_2#

Keep in mind that the answer must be rounded to one significant figure because that's the number of sig figs you have for your data.

This means that you have

#color(darkgreen)(ul(color(black)("moles of N"_2 = "2 moles")))#

As a fun fact, it's worth mentioning that this reaction is used to inflate airbags in cars.