What is the change in enthalpy associated with the combustion of 530 g of methane (CH₄)?

Given the following at 25°C, calculate ΔH_f for HCN(g) (in kJ/mol) at 25°C.

In many ways, hydrogen as a biofuel compares very favorably to ethanol and other fuels.

Which answer best describes the transfer of heat that occurs when 1.30 mol of H₂ reacts?

Ozone, O₃(g), is a form of elemental oxygen that plays an important role in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O₂(g) at room temperature and pressure according to the following reaction: 2 O₃(g) → 3 O₂(g) ΔH= -284.6 kJ b. Which has the higher enthalpy under these conditions, 2 O₃(g) or 3 O₂(g)?

Using values from Appendix C, calculate the value of H for each of the following reactions: (a) NiO(s) + 2 HCl(g) → NiCl₂(s) + H₂O(g)