For the chemical reaction
H₂ (g) + F₂ (g) → 2 HF (g) ∆H° = -79.2 kJ/mol.
What is the enthalpy for the reaction in kJ/mol?
3 H₂ (g) + 3 F₂ (g) → 6 HF (g)

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?

What is the largest environment on earth?