The molar concentration of human DNA in a human diploid cell is as follows:

$\begin{array}{l}\Rightarrow \text{ Total number of chromosomes }\times 6.023\times {10}^{23}\\ \Rightarrow 46\times 6.023\times {10}^{23}\Rightarrow 2.77\times {10}^{23}\mathrm{moles}\end{array}$

Hence, the molar concentration of DNA in each diploid cell in humans is 2.77 x 10^23 moles.