The combustion of ammonia by the following reaction yields nitric oxide and water

4 nh3 (g) + 5 o2 (g) → 4 no (g) + 6 h2o (g)

determine the heat of reaction (δhrxn) for this reaction by using the following thermochemical data:

n2 (g) + o2 (g) → 2 no (g) δh = 180.6 kj

n2 (g) + 3 h2 (g) → 2 nh3 (g) δh = - 91.8 kj

2 h2 (g) + o2 (g) → 2 h2o (g) δh = - 483.7 kj

hess' law problems

2. determine the heat of reaction (δhrxn) for the process by which hydrazine (n2h4) is formed from its elements:

n2 (g) + 2 h2 (g) → n2h4 (g)

by using the following thermochemical data:

n2h4 (g) + o2 (g) → n2 (g) + 2 h2o (g) δh = - 622.2 kj

h2 (g) + 1/2 o2 (g) → h2o (g) δh = - 285.8 kj

hess' law problems

3. determine the heat of reaction (δhrxn) for the process by which lead (ii) chloride (pbcl2) is formed from its elements:

pb (s) + cl2 (g) → pbcl2 (s)

by using the following thermochemical data:

pb (s) + 2 cl2 (g) → pbcl4 (l) δh = - 329.3 kj

pbcl2 (s) + cl2 (g) → pbcl4 (l) δh = + 30.1 kj

hess' law problems

4. determine the heat of reaction (δhrxn) for the process by which acetic acid (ch3cooh) is formed from its elements:

c (graphite) + 2 h2 (g) + o2 (g) → ch3cooh (l)

by using the following thermochemical data:

ch3cooh (l) + o2 → 2 co2 (g) + 2 h2o(l) δh = - 871 kj

c (graphite) + o2 (g) → 2 co2 (g) δh = - 394 kj

h2 (s) + 1/2 o2 (g) → h2o(l) δh = - 286 kj

heat of formation problems

5. determine the heat of reaction (δhrxn) for the combustion of ethanol (c2h5oh) by using heat of formation data:

c2h5oh (l) + 3 o2 (g) → 2 co2 + 3 h2o (g)

heat of formation problems

6. determine the heat of reaction (δhrxn) for the chlorination of methane (ch4) by using heat of formation data:

ch4 (g) + 4 cl2 (g) → ccl4 (g) + 4 hcl (g)

heat of formation problems

7. determine the heat of reaction (δhrxn) for the reduction of acetaldehyde (ch3cho) to ethanol (c2h5oh) by using heat of formation data:

ch3cho (g) + h2 (g) → c2h5oh (l)

heat of formation problems

8. determine the heat of reaction (δhrxn) for the reaction of calcium carbonate (caco3) with hcl to produce co2 by using heat of formation data:

caco3 (s) + 2 hcl (g) → cacl2 (s) + co2 (g) + h2o (g)

expert answer