In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate in which heat is evolved and an unreactive gas is produced.
What is the equation for this reaction?
A 2Al + Ba(NO3)2 → Al2O3 + BaO + 2NO
B 4Al + 4Ba(NO3)2 → 2Al2O3 + 4Ba(NO2)2 + O2
C 10Al + 3Ba(NO3)2 → 5Al2O3 + 3BaO + 3N2
D 10Al + 18Ba(NO3)2 → 10Al(NO3)3 + 18BaO + 3N2

Why is C the answer?

Question

In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate in which heat is evolved and an unreactive gas is produced.
What is the equation for this reaction?
A 2Al + Ba(NO3)2 → Al2O3 + BaO + 2NO
B 4Al + 4Ba(NO3)2 → 2Al2O3 + 4Ba(NO2)2 + O2
C 10Al + 3Ba(NO3)2 → 5Al2O3 + 3BaO + 3N2
D 10Al + 18Ba(NO3)2 → 10Al(NO3)3 + 18BaO + 3N2

Why is C the answer?

academicgurusinc · Answer

Because formation of alumina (Al2O3) is exothermic and the inert gas evolved is N2. A and B can't be correct because these do not involve formation of N2 (inert gas) and D is incorrect because formation of Al(NO3)3 is an endothermic process. I hope that helps. If you found this helpful, I encourage you to subscribe to our youtube channel ( https://www.youtube.com/channel/UCYiI7SmkU4_vhdSzKBWsifg), to stay current with all of our new videos. Regards, Academic Gurus Inc. Twitter (Academic_Gurus) Facebook (AcademicGurusInc) Youtube (Academic Gurus Inc)