Q. 34 C4.0( 9 Votes )

# An element Z contains two naturally occurring isotopes . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

Answer :

Given, Average atomic mass = 35.5 u

Let % amount of ^{35}Z_{17} be y, then amount of ^{37}Z_{17} is (100 - y).

So,

So, 35y + 3700 – 37y = 3550

Hence, y = 75

Thus, amount of ^{35}Z_{17} is 75% and amount of ^{37}Z_{17} is 25%

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