Question

In: Chemistry

Calculate delta H rxn (at 500K) for the formation of 1 mol of ammonia gas. (show...

Calculate delta H rxn (at 500K) for the formation of 1 mol of ammonia gas. (show worked out solution)

Solutions

Expert Solution

Nitrogen gas (N2) and hydrogen gas (H2) can be made to combine to form NH3, or ammonia gas.

The reaction is N2 + 3H2 2NH3

This equation says that one mole of N2 requires three moles of H2 for a complete reaction, and this would then yield two moles of NH3.

Nitrogen

+

Hydrogen

Ammonia

N2

+

3H2

2NH3

+

3 H-H

2NH3

1 mole of N2

+

3 moles of H2

2 moles of ammonia

28 g of N

+

6 g of H

34 g ammonia

H= -92.4 KJ/mol

92.4kJ of energy is released for every one mole of N2

92.4kJ of energy is released for every three moles of H2

92.4kJ of energy is released for every two moles of NH3 produced.

Hence one mole of NH3 produces 92.4/2 = 46.0 kJ/mol energy

H = m*c*T

where m is mass of reactant

c is specific heat of product &

T is temperature

H = 0.02kg*6.74kJ/kgK*500

=67.4kJ/mol


Related Solutions

Use delta H f and S to calculate delta G rxn (delta g not sys) at...
Use delta H f and S to calculate delta G rxn (delta g not sys) at 25 C for the reaction below: 4KClO3 (s) --> 4KClO4 (s) + KCL (s) Delta H not f KCLO3 = -397.7 kj/mol; KCLO4 = -432.8 kJ/mol; KCL = -436.7 kJ/mol S KCLO3 = 143.1 kJ/mol ; KCLO4= 151.0 kJ/mol; KCL = 82.6 kJ/mol
Calculate Delta H rxn for the following reaction (watch the significant figures) 2 NOCl (g) -->...
Calculate Delta H rxn for the following reaction (watch the significant figures) 2 NOCl (g) --> N2(g) + 02(g) + Cl2(g) Given the following set of reactions; 1/2 N2(g) + 1/2 02(g) ---> NO(g) Delta H= 90.3KJ NO(g) + 1/2 Cl2(g) ---> NOCl(g) Delta H = - 38.6 KJ
calculate delta H for the formation of one mole of N2O5 from the elements at 25...
calculate delta H for the formation of one mole of N2O5 from the elements at 25 celsius using the following data. 2H2(g) + O2- 2H2O(l) delta H= -571.6 kj N2O5(g) + H2O- 2HNO3(l) delta H= -73.7kj 1/2N2(g) + 3/2O2(g) + 1/2H2(g) - HNO3(l) delta H=-174.kj
A 1.0 mol sample of helium gas and a 1.0 mol sample of ammonia gas are...
A 1.0 mol sample of helium gas and a 1.0 mol sample of ammonia gas are held at the same temperature. Assuming both behave as ideal gases, do they have the same total internal energy?
In which of the following processes is (delta)H = (delta)E? Why? (a) Two moles of ammonia...
In which of the following processes is (delta)H = (delta)E? Why? (a) Two moles of ammonia gas are cooled from 325 C to 300 C at 1.2atm (b) One gram of water is vaporized at 100C and 1 atm. (c) A mole of nitrogen gas reacts with a mole of oxygen gas to form two moles of nitric oxide gas in a 40L container. (d) Calcium carbonte is heated to form calcium oxide and carbon dioxide in a container with...
For each reaction, calculate Δ H ∘ rxn , Δ S ∘ rxn , and Δ...
For each reaction, calculate Δ H ∘ rxn , Δ S ∘ rxn , and Δ G rxn at 29 ∘ C . A) N2O4(g)→2NO2(g) B) NH4Cl(s)→HCl(g)+NH3(g) C) 3H2(g)+Fe2O3(s)→2Fe(s)+3H2O(g) D) N2(g)+3H2(g)→2NH3(g)
What is the delta H of the following reaction of methane and ammonia in kJ/mole?
What is the delta H of the following reaction of methane and ammonia in kJ/mole?CH4 (g) + NH3 (g) -----> HCN (g) + 3H2 (g) Delta H rxn = ? kJ / moleNote, this is at a temperature different than the standard tables so you can't use those to solve this. Use the following reaction enthalpy data.N2 (g) + 3 H2 (g) ---> 2 NH3(g). Delta H = -101.8 kJ/moleC (s) + 2 H2 (g) ---> CH4 (g) Delta H...
a) Calculate the change in entropy on heating an ideal gas from 300K to 500K at...
a) Calculate the change in entropy on heating an ideal gas from 300K to 500K at constant pressure. b) Calculate the change in entropy on heating an ideal gas from 300K to 500K at constant volume. c) why these answers are different. Please explain each steps.
If delta H rxn is -75.2 kJ, 2NO(g) + Cl2 (g) <---> 2NOCl(g)
If delta H rxn is -75.2 kJ, 2NO(g) + Cl2 (g) <---> 2NOCl(g) A scientist places four moles of nitrogen monoxide and two moles of chlorine gas into flask A and the same amounts into Flask B, then allows the systems to reach equilibrium. Flask A is at 25 degrees Celsius and Flask B is at 200 degrees Celsius A) In which flask will the reaction occur faster? Explain. B) In which flask will the reaction occur to a greater...
[2] Calculate ∆H°rxn and ∆S°rxn for the following reaction and decide in which direction each of...
[2] Calculate ∆H°rxn and ∆S°rxn for the following reaction and decide in which direction each of these factors will drive the reaction. N2(g) + 3 H2(g) → 2 NH3(g)
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT