Calculate ∆Hrxn for the following reaction:CH4 (g) + 4 Cl2 (g) → CCL4 (g) + 4 HCl (g) Use the following reactions and give ∆H values:C (s) + 2H2 (g) → CH4 (g) ∆ H = -74.6 kJC (s) + 2Cl2 (g) → CCL4 (g) ∆ H = -95.7 kJH2 (g) + Cl2 (g) → 2HCl (g) ∆ H = -92.3 kJ

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?