CH 4 (g) + NH 3 (g) ---> HCN (g) + 3 H 2 B. NaHCO 3 (s) ---> CO 2 (g) + NaOH (s)
ID: 919451 • Letter: C
Question
CH4 (g) + NH3 (g) ---> HCN (g) + 3 H2
B. NaHCO3 (s) ---> CO2 (g) + NaOH (s)
C. The space shuttle's reusable booster rockets use a mixture of powdered aluminum and ammonium perchlorate to drive the rockets. The reaction that takes place is:
3 Al (s) + 3 NH4ClO4 (s) ---> Al2O3 (s) + AlCl3 (s) + 3 NO (g) + 6 H2O (g)
Calculate the amount of thermal energy, in kilojoules, released for each gram of aluminum.
Compound Hf CH4 -748.5 kJ/mole NH3 -46.3 kJ/mole HCN + 130.5 kJ/mole H2 0, by definitionExplanation / Answer
A)
CH4 (g) + NH3 (g) ---> HCN (g) + 3 H2
Hrxn = Hproducts - Hreactants
Hrxn = 130.5 +3*0 - (-748.5 + 46.3 ) = 832.7 kJ/mol
b)
NaHCO3 (s) ---> CO2 (g) + NaOH (s)
Hrxn = Hproducts - Hreactants
Hrxn = -393.5 + -425.9 --1100.8 = 281.4 kJ7mol
C)
3 Al (s) + 3 NH4ClO4 (s) ---> Al2O3 (s) + AlCl3 (s) + 3 NO (g) + 6 H2O (g)
Hrxn = Hrpod - Hrctn
Hrxn = -1669.8 + -705.6 +3*90.29 +6*-241.8 -(3*0 + 3*-295.3) = -2669.43 kJ/mol