What is half of 81 because i need on my math home work

It is 40.5 becuase it is not a even number

So you would divide 81 by 2 which will not be a whole number but the answer is 40.5

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.