Calculate δs°(universe) for the decomposition of 1 mol of gaseous phosphine (ph3) to form white phosphorus and gaseous hydrogen at 25 °c.

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What’s the theoretical yield of solid lead