Aplatinum wedding band contains 0.077 mol of platinum. how many atoms of platinum are in the 15-gram platinum wedding band?

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

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

What substance has a mass of 9.5g and volume of 2.1cm^3