Carbonyl compounds undergo neutrophilic additional reaction where as alkanes undergo electrophilic addition reaction explain

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

How many moles in .5g of sodium bromide?

How many moles are in 1.26*10^24 particles in significant figures