How many moles of oxygen gas could be produced by 120 moles of lead (II) nitrate?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?