1.
The table below shows standard enthalpy changes of formation:
CO2(g) = -394
NH4NO3(s) = -366
H2O(g) = -242
What is the enthalpy change for the following reaction?
2NH4NO3(s) + C(s) + 2N2 (g) + 4H2O(g) + CO2(9)

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.