To answer this, all you have to do is take the mass of the sample, in grams, and divide it by the atomic/molecular mass of the substance, in amu (atomic mass units) So, here are my answers: (i) 53g of Palladium = 53/106 = 0.5 moles (ii) 216g of Silver = 216/108 = 2 moles (iii) 46g of Tungsten = 46/184 = 0.25 moles
A combustion reaction will always be associated with a change in entropy that is Positive due to the gaseous products released. Hence, there is a large positive entropy change.