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Q.

The relative atomic masses of  86Sr   87Sr,and 88 Sr are  85.91,86.91 and 87.91 respectively. Calculate the atomicmass of strontium if a sample of strontium consists of followingthree isotopes, i.e.,  86Sr   87Sr and  88 Sr  have natural abundances 9.86 %, 7.58% and 82.56% respectively.

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answer is 87.64.

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Detailed Solution

Average atomic mass of strontium = [Fractionalabundance of  86Sr× mass of  86Sr+  [Fractional abundance of 87Sr× + [Fractional abundance of  88Sr× mass of  88Sr].=9.86100×85.91+7.58100×86.91+82.56100×87.91=8.47+6.59+72.58                         = 87.64
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