From the given info, we know the amount of heat released when 2 moles of Na is reacted. We're asked for the heat per 0.5 moles. So, (368.6 kJ/2mol)0.5000 mol = 92.15...
The law of multiple proportion displays that when 2 elements combine with each other forming 2 or more chemical compound then different amount of 1 element which react with definite...