سؤال عاجل

the
hydrogen sulfide in a 0.50 g
sample of crude petroleum was removed by distillation and collected in a
solution of cdcl2 .the precipitated cds was then feltered , washed , and
ignited to cdso4 . calculae the percentage of h2s in the sample if 0.108 g of cdso4 was
recovered
هذا سؤال في الكيمياء التحليلية للمستوى الثاني ؟ أرجو المساعدة في الحل