A researcher purchased two $1ppb$ standards of the organochlorine pesticide, DDT $($dichlorodiphenyltrichloroethane$)$ to calibrate an analytical instrument. If the matrix $($solvent$)$ for one standard is water and the other is hexane, which of the following statements is true? Assume that the density of water and hexane is $1\frac{g}{m}L$ and $0\mathrm{.}66\frac{g}{m}L,$ respectively.

When converted to mass$/$volume unit, the concentration of the standard in hexane is higher

In mass$/$mass unit, both standards are equal to $1g$ DDT$/$g

When converted to mass$/$volume unit, the concentration is equal in both matrices

When converted to mass$/$volume unit, the concentration of the standard in water is higher

In mass$/$mass unit, the concentration of the standard in water is higher