The average atomic mass of a sample of an ele | vedclass

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(A) Let the percentage composition of $_{17}^{37}y$ be $x$.Then the percentage composition of $_{17}^{35}y$ will be $100-x$.Now,the average atomic mas

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$25\%, 75\%$

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(A) Let the percentage composition of $_{17}^{37}y$ be $x$.Then the percentage composition of $_{17}^{35}y$ will be $100-x$.Now,the average atomic mass is calculated as:$\frac{x}{100} 	imes 37 + \frac{100-x}{100} 	imes 35 = 35.5$$\frac{37x + 3500 - 35x}{100} = 35.5$$2x + 3500 = 3550$$2x = 50$$x = 25\%$Therefore,the percentage of $_{17}^{37}y$ is $25\%$ and the percentage of $_{17}^{35}y$ is $100 - 25 = 75\%$.

The average atomic mass of a sample of an element $y$ is $35.5 \,u$. What are the percentages of isotopes $_{17}^{37}y$ and $_{17}^{35}y$ in the sample?

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