Stioichiometry

Q: Natural chloride occur as a mixture of isotopes.If a mixture contains 75% 35 Cl 17 and 25% 37 Cl 17 ,determine its molecular weight:

(a) :  34.5
(b) :  35.5
(c) :  72.5
(d) :  72.10s
(e) :  None of the Above
Answer:  35.5
Explanation:  1.0 mole of chlorine =0.75 mole of 35 Cl 17 +0.25 mol of 37 Cl 17 .

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