Question

element q has the following isotopes:
isotope atomic mass (amu) abundance (%)
q-101 100.912 amu 17.30%
q-102 101.907 amu 23.80%
q-103 102.905 amu 40.20%
q-104 103.904 amu 18.70%
the average atomic mass of element q is: amu

Explanation:

Step1: Convert percentages to decimals

$17.30\% = 0.1730$, $23.80\%=0.2380$, $40.20\% = 0.4020$, $18.70\%=0.1870$

Step2: Calculate the contribution of each isotope

For Q - 101: $100.912\times0.1730 = 17.457776$
For Q - 102: $101.907\times0.2380=24.253866$
For Q - 103: $102.905\times0.4020 = 41.36781$
For Q - 104: $103.904\times0.1870=19.420048$

Step3: Sum up the contributions

$17.457776 + 24.253866+41.36781+19.420048 = 102.50$

Answer:

$102.50$