Need in chemistry: how to convert kg to mg? for example: 0.00576kg converted to its equivalent measurement in mg? can you show the process so i understand how to do it?

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.