Calculate the enthalpy for this reaction: 2C(s) + H2() → C2H2(g)
ΔH° = ??? kJ

Given the following thermochemical equations:
C2H2(g) + (5/2)O2(g) → 2CO2(g) + H2O(ℓ)
ΔH° = -1299.5 kJ

C(s) + O2(g) → CO2(g)
ΔH° = -393.5 kJ

H2(g) + (1/2)O2(g) → H2O(ℓ)
ΔH° = -285.8 kJ

Remember to use the proper number of significant figures and leading zeros in all calculations.gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

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.