Question

Find the average atomic mass round and to the second decimal place (0.01)

Answer 1

We have that

The average atomic mass round and to the second decimal place (0.01) is

A_m=126.90

From the question we are told

Find the average atomic mass round and to the second decimal place (0.01)

80% 127I, 17% 126I, 3% 128I

Generally the equation for the Average Mass   is mathematically given as

Where

a1 = 127  

b1 = 80%  

a2 = 126  

b2 = 17%  

a3 = 128  

b3 = 3%

$A_m=|\frac{80 *127I +17 *126I+ 3 *128I}{100}$

Therefore

$A_m=|\frac{127*80+126*17+128*3}{100}\\\\A_m=126.90$

In conclusion

The average atomic mass round and to the second decimal place (0.01) is

A_m=126.90

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