Consider the following data: Three entries. 1: Delta H f 1 of C O 2 equals negative 393.5 kilojoules per mole. 2: Delta H f 1 H 2 O equals negative 241.82 kilojoules per mole. 3: Delta H f 1 C 2 H 2 equals negative 84.68 kilojoules per mole.

Using these data, calculate for this chemical reaction. Round to the nearest whole number.

2C2H6(g) + 7O2(g) -> 4CO2(g) + 6H2O(g)

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.