B. Use Hess's law and the following equations to calculate the ΔHreaction for the reaction C3H8(g) + 5O2(g) --> 3CO2 (g) + 4H2O(l). Show your work. 3C(s) + 4H2 (g) --> C3 H8 (g) ΔH = –103.85 kJ/mol
C(s) + O2 (g) --> CO2 (g) ΔH = –395.5 kJ/mol
2H2 (g) + O2 (g) 2H2O(l) ΔH = –571.66 kJ/mol

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon? a balloon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.