Chemistry

Problem

Element X has two naturally occurring isotopes,

^{64}\text{X}

and

^{66}\text{X}

. Their relative abundances are 30.0\% and 70.0\%, respectively. If the abundance of

^{66}\text{X}

decreases while that of

^{64}\text{X}

increases, how will the average atomic mass of X change? a) It will increase. b) It will remain the same. c) It will decrease. d) It cannot be predicted without knowing the total number of atoms.

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