In Humans, how many chromosomes should be in each of these diploid cells after mitosis?

Each human diploid cell must have 46 chromosomes. We call this the "2N" number.

If a haploid cell has n chromosomes, a diploid cell has 2n (n represents a number, which is different for every species - in humans, for example, n = 23 and 2n = 46). Both diploid and haploid cells can undergo mitosis.