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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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