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Nanoparticles with a gold core and organothiol outer shell with well-defined stoichiometries Aux(SR)y can be prepared and isolated. The MALDI-time-of-flight mass spectrum of the nanoparticle with R=CH2CH2C6H5 exhibits a broad molecular ion at m/z76.3kDa. Electrospray ionization gives a series of sharp peaks at m/z38152.7( charge =+2),25433.3(+3),19075.2(+4), and 15260.4(+5). Find the average molecular mass of Aux(SCH2CH2C6H5) from the four peaks. average molecular ion mass: Da In another electrospray experiment, the (z=3) ions for three different thiol shells were found at m/z27243(R=nC12H25) ), 25440(R=CH2CH2C6H5), and 24876(R=nC6H13). Compute the mass of the molecular ion for the three. Aux(SR)y nanoparticles. R=nC12H25 molecular ion mass: R=CH2CH2C6H5 molecular ion mass: Da R=nC6H13 molecular ion mass: Assuming that x is constant, find the value of y for each nanoparticle from the difference in molecular mass between the molecular ions. y= From the value of y, find the value of x. Note that Au is monoisotopic with a mass of 196.9666 . Assuming that x is constant, find the value of y for each nanoparticle from the difference in molecular mass between the molecular ions. y= From the value of y, find the value of x. Note that Au is monoisotopic with a mass of 196.9666 . x= 77. K. Kumara and A. Dass, "Au (SR)y Nanomolecules: Compositional Assignment of the 76.3 kDa Plasmonic Faradaurates," Anal. Chem. 2014, 86, 4227