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Question Number 21661 by tawa tawa last updated on 30/Sep/17

Commented by tawa tawa last updated on 30/Sep/17

$$\left(1\right)$$$$\mathrm{Oxygen}\mathrm{gives}\mathrm{three}\mathrm{lines}\mathrm{in}\mathrm{mass}\mathrm{spectrometer},\mathrm{indicating}\mathrm{the}\mathrm{existence}\mathrm{of}$$$$\mathrm{three}\mathrm{types}\mathrm{of}\mathrm{oxygen}\mathrm{atom}\mathrm{with}\mathrm{masses}15.995,16.999,\mathrm{with}\mathrm{relative}$$$$\mathrm{abundance}\mathrm{of}99.76,0.04\mathrm{and}0.20\mathrm{respectively}.\mathrm{Determine}\mathrm{the}\mathrm{relative}$$$$\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{oxygen}$$$$$$$$\left(2\right)$$$$\mathrm{An}\mathrm{element}\mathrm{Y}\mathrm{has}\mathrm{two}\mathrm{isotopes}{\mathrm{Y}}_{10}^{20}\mathrm{and}{\mathrm{Y}}_{10}^{22}\mathrm{present}\mathrm{in}\mathrm{the}\mathrm{ratio}\mathrm{of}1:3\mathrm{respectively},$$$$\mathrm{calculate}\mathrm{the}\mathrm{relative}\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{Y}$$$$$$$$\left(3\right)$$$$\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{a}\mathrm{naturally}\mathrm{occuring}\mathrm{element}\mathrm{is}69.72\mathrm{a}.\mathrm{m}.\mathrm{u}.\mathrm{The}\mathrm{masses}$$$$\mathrm{of}\mathrm{the}\mathrm{naturally}\mathrm{occuring}\mathrm{isotopes}\mathrm{are}68.9251\mathrm{a}.\mathrm{m}.\mathrm{u}\mathrm{for}{\mathrm{X}}^{69}\mathrm{and}70.9245$$$$\mathrm{a}.\mathrm{m}.\mathrm{u}.\mathrm{for}{\mathrm{X}}^{71}.\mathrm{Calculate}\mathrm{the}\mathrm{percentage}\mathrm{abundance}\mathrm{of}\mathrm{each}\mathrm{isotope}\mathrm{and}\mathrm{the}$$$$\mathrm{isotopic}\mathrm{ratio}\mathrm{of}{\mathrm{X}}^{69}\mathrm{to}{\mathrm{X}}^{71}$$$$$$$$\left(4\right)$$$$\mathrm{Naturally}\mathrm{occuring}\mathrm{lithium}\mathrm{consists}\mathrm{of}\mathrm{two}\mathrm{isotopes}{\mathrm{Li}}_3^6\mathrm{and}{\mathrm{Li}}_3^7\mathrm{with}\mathrm{atomic}$$$$\mathrm{masses}6.0151\mathrm{and}\mathrm{x}\mathrm{respectively}.\mathrm{If}{\mathrm{Li}}_3^7\mathrm{has}\mathrm{an}\mathrm{abundance}\mathrm{of}92.5\mathrm{\%}\mathrm{and}$$$${\mathrm{Li}}_3^6\mathrm{has}7.48\mathrm{\%}.\mathrm{Calculate}\mathrm{the}\mathrm{value}\mathrm{of}\mathrm{x}\mathrm{given}\mathrm{that}\mathrm{the}\mathrm{relative}\mathrm{atomic}\mathrm{mass}$$$$\mathrm{of}\mathrm{the}\mathrm{atom}\mathrm{is}6.940.$$

Commented by tawa tawa last updated on 30/Sep/17

$$\mathrm{please}\mathrm{help}.\mathrm{God}\mathrm{bless}\mathrm{you}.$$

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