Interpretation:

The elements in their standard states on the scale of standard enthalpies of formations are to be described.

Concept introduction:

The standard enthalpy of formation is defined as heat change when one mole of a compound is formed in standard state.

Expert Solution & Answer

Answer to Problem 40SSC

The standard enthalpies of formation of elements in standard state are assigned zero value.

Explanation of Solution

Standard enthalpy of formation of element is taken as zero. With this zero point all the compounds are assigned enthalpies in positive or negative side.

Conclusion

To make the calculations easy, standard enthalpies of formation of elements in standard state are assigned zero value.

Chapter 15.4, Problem 39SSC

Chapter 15.4, Problem 41SSC

Chapter 15 Solutions

Chemistry: Matter and Change

Ch. 15.1 - Prob. 1PP Ch. 15.1 - Prob. 2PP Ch. 15.1 - Prob. 3PP Ch. 15.1 - Prob. 4PP Ch. 15.1 - Prob. 5PP Ch. 15.1 - Prob. 6PP Ch. 15.1 - Prob. 7SSC Ch. 15.1 - Prob. 8SSC Ch. 15.1 - Prob. 9SSC Ch. 15.1 - Prob. 10SSC

Ch. 15.1 - Prob. 11SSC Ch. 15.2 - Prob. 12PP Ch. 15.2 - Prob. 13PP Ch. 15.2 - Prob. 14PP Ch. 15.2 - Prob. 15PP Ch. 15.2 - Prob. 16SSC Ch. 15.2 - Prob. 17SSC Ch. 15.2 - Prob. 18SSC Ch. 15.2 - Prob. 19SSC Ch. 15.2 - Prob. 20SSC Ch. 15.2 - Prob. 21SSC Ch. 15.2 - Prob. 22SSC Ch. 15.3 - Prob. 23PP Ch. 15.3 - Prob. 24PP Ch. 15.3 - Prob. 25PP Ch. 15.3 - Prob. 26SSC Ch. 15.3 - Prob. 27SSC Ch. 15.3 - Prob. 28SSC Ch. 15.3 - Prob. 29SSC Ch. 15.3 - Prob. 30SSC Ch. 15.3 - Prob. 31SSC Ch. 15.4 - Prob. 32PP Ch. 15.4 - Prob. 33PP Ch. 15.4 - Prob. 34PP Ch. 15.4 - Prob. 35PP Ch. 15.4 - Prob. 36PP Ch. 15.4 - Prob. 37PP Ch. 15.4 - Prob. 38SSC Ch. 15.4 - Prob. 39SSC Ch. 15.4 - Prob. 40SSC Ch. 15.4 - Prob. 41SSC Ch. 15.4 - Prob. 42SSC Ch. 15.4 - Prob. 43SSC Ch. 15.5 - Prob. 44PP Ch. 15.5 - Prob. 45PP Ch. 15.5 - Prob. 46PP Ch. 15.5 - Prob. 47PP Ch. 15.5 - Prob. 48SSC Ch. 15.5 - Prob. 49SSC Ch. 15.5 - Prob. 50SSC Ch. 15.5 - Prob. 51SSC Ch. 15.5 - Prob. 52SSC Ch. 15 - Prob. 53A Ch. 15 - Prob. 54A Ch. 15 - Prob. 55A Ch. 15 - Prob. 56A Ch. 15 - Prob. 57A Ch. 15 - Prob. 58A Ch. 15 - Prob. 59A Ch. 15 - Prob. 60A Ch. 15 - Prob. 61A Ch. 15 - Prob. 62A Ch. 15 - Prob. 63A Ch. 15 - Prob. 64A Ch. 15 - Prob. 65A Ch. 15 - Prob. 66A Ch. 15 - Metallurgy A 25.0-g bolt made of an alloy...Ch. 15 - Prob. 68A Ch. 15 - Prob. 69A Ch. 15 - Prob. 70A Ch. 15 - Prob. 71A Ch. 15 - Prob. 72A Ch. 15 - Prob. 73A Ch. 15 - How many joules of heat are lost by 3580 kg of...Ch. 15 - Swimming Pool A swimming pool measuring 20.0m12.5m...Ch. 15 - How much heat is absorbed by a 44.7-g piece of...Ch. 15 - Prob. 77A Ch. 15 - Alloys When a 58.8-g piece of hot alloy is placed...Ch. 15 - Prob. 79A Ch. 15 - Prob. 80A Ch. 15 - Prob. 81A Ch. 15 - Prob. 82A Ch. 15 - sUse information from Figure 15.24 to calculate...Ch. 15 - Agriculture Water is sprayed on oranges during...Ch. 15 - Grilling What mass of propane (C3H8) must be...Ch. 15 - Heating with Coal How much heat is liberated...Ch. 15 - How much heat is evolved when 1255 g of water...Ch. 15 - A sample of ammonia (Hsolid=5.66kJ/mol)...Ch. 15 - Prob. 89A Ch. 15 - Prob. 90A Ch. 15 - Prob. 91A Ch. 15 - Prob. 92A Ch. 15 - Prob. 93A Ch. 15 - Prob. 94A Ch. 15 - Prob. 95A Ch. 15 - Prob. 96A Ch. 15 - Prob. 97A Ch. 15 - Prob. 98A Ch. 15 - Prob. 99A Ch. 15 - Prob. 100A Ch. 15 - Prob. 101A Ch. 15 - Prob. 102A Ch. 15 - Prob. 103A Ch. 15 - Heat was added consistently to a sample of water...Ch. 15 - Bicycling Describe the energy conversions that...Ch. 15 - Hiking Imagine that on a cold day you are planning...Ch. 15 - Differentiate between the enthalpy of formation of...Ch. 15 - Analyze both of the images in Figure 15.27 in...Ch. 15 - Apply Phosphorus trichloride is a starting...Ch. 15 - Calculate Suppose that two pieces of iron, one...Ch. 15 - Prob. 111A Ch. 15 - sample of natural gas is analyzed and found to...Ch. 15 - Prob. 113A Ch. 15 - Prob. 114A Ch. 15 - Prob. 115A Ch. 15 - Prob. 116A Ch. 15 - Prob. 117A Ch. 15 - Prob. 118A Ch. 15 - Prob. 119A Ch. 15 - Prob. 120A Ch. 15 - Prob. 121A Ch. 15 - Prob. 122A Ch. 15 - Prob. 123A Ch. 15 - Prob. 124A Ch. 15 - Prob. 125A Ch. 15 - Prob. 126A Ch. 15 - Prob. 127A Ch. 15 - Prob. 1STP Ch. 15 - Prob. 2STP Ch. 15 - Prob. 3STP Ch. 15 - Prob. 4STP Ch. 15 - Prob. 5STP Ch. 15 - Prob. 6STP Ch. 15 - Prob. 7STP Ch. 15 - Prob. 8STP Ch. 15 - Prob. 9STP Ch. 15 - Prob. 10STP Ch. 15 - Prob. 11STP Ch. 15 - Prob. 12STP Ch. 15 - Prob. 13STP Ch. 15 - Prob. 14STP Ch. 15 - Prob. 15STP Ch. 15 - Prob. 16STP Ch. 15 - Prob. 17STP Ch. 15 - Prob. 18STP

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