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Question Number 155190 by joki last updated on 26/Sep/21

an atom of x with atomic number 9 has  a mass of  18 with an abundsnce of 19%, a mass of 19 with  an abundance of 3.5% and the remainder has a   mass of 20. determine the relative mass of atom x?

$$\mathrm{an}\:\mathrm{atom}\:\mathrm{of}\:\mathrm{x}\:\mathrm{with}\:\mathrm{atomic}\:\mathrm{number}\:\mathrm{9}\:\mathrm{has}\:\:\mathrm{a}\:\mathrm{mass}\:\mathrm{of} \\ $$$$\mathrm{18}\:\mathrm{with}\:\mathrm{an}\:\mathrm{abundsnce}\:\mathrm{of}\:\mathrm{19\%},\:\mathrm{a}\:\mathrm{mass}\:\mathrm{of}\:\mathrm{19}\:\mathrm{with} \\ $$$$\mathrm{an}\:\mathrm{abundance}\:\mathrm{of}\:\mathrm{3}.\mathrm{5\%}\:\mathrm{and}\:\mathrm{the}\:\mathrm{remainder}\:\mathrm{has}\:\mathrm{a}\: \\ $$$$\mathrm{mass}\:\mathrm{of}\:\mathrm{20}.\:\mathrm{determine}\:\mathrm{the}\:\mathrm{relative}\:\mathrm{mass}\:\mathrm{of}\:\mathrm{atom}\:\mathrm{x}? \\ $$

Answered by physicstutes last updated on 26/Sep/21

Ram =((19×18+3.5×19+77.5×20)/(100))=97.9

$$\mathrm{Ram}\:=\frac{\mathrm{19}×\mathrm{18}+\mathrm{3}.\mathrm{5}×\mathrm{19}+\mathrm{77}.\mathrm{5}×\mathrm{20}}{\mathrm{100}}=\mathrm{97}.\mathrm{9} \\ $$

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