#(NH_4)_2Cr_2O_7 (s) -> N2 (g) + 4H_2O (g) + Cr_2O_3 (s) + 200 kJ#. What is the molar ratio?

1 Answer
anor277
Jul 6, 2016

The molar ratio is as you have written.

Explanation:

#(NH_4)_2Cr_2O_7(g) rarr N_2(g) + 4H_2O(l) + Cr_2O_3(s) + Delta#

This is a stoichiometrically balanced equation. It tells us explicitly that #252.1*g# of ammonium chromate decomposes under heating to give #14*g# of dinitrogen gas, #72*g# of water, and #152*g# chromium(III) oxide. If you add up the product and reactant masses, you will see that they agree; and they must agree, that is mass is conserved in every chemical reaction.

So in molar terms, #1# #mol# #"ammonium dichromate"# decomposes to give #1# #mol# #"dinitrogen gas"# + etc. If you are not satisfied, voice your objections, and someone here will have another go.

Related questions
See all questions in Mole Ratios
Impact of this question
2043 views around the world
You can reuse this answer
Creative Commons License