A high-resolution mass spectrum of element R displays four isotopes with the data below

CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

A high-resolution mass spectrum of element R displays four isotopes with the data below. Isotope Mass (amu) Peak area

^{85}\text{R}

84.911 47

^{87}\text{R}

86.909 265

^{88}\text{R}

87.907 19

^{89}\text{R}

88.905 3 Determine the average atomic mass of element R, expressed in g·mol

^{-1}

, to the nearest 0.001. (a)

86.909\;\text{g}\cdot\text{mol}^{-1}

(b)

87.158\;\text{g}\cdot\text{mol}^{-1}

(c)

86.703\;\text{g}\cdot\text{mol}^{-1}

(d)

86.794\;\text{g}\cdot\text{mol}^{-1}