Question

1- A 1.0000 gram sample of zinc metal is added to a solutioncontaining 1.2500 grams of an unknown compound made of niobium,fluoride, and chloride. The reaction results in the formation ofzinc fluoride, zinc chloride, and metallic niobium, When thereaction is complete, unreacted zinc remains, and this unreactedzinc is "burned off" by reaction with hydrochloric acid.Afterwashing and drying, the mass of niobium metal recovered is 0.4900grams.

a) calculate the experimental percentage of niobium in theoriginal unknown compund.

b) In a separate experiment, a 4.0000gram sample of theunknown compound was found to contain 0.6406 gram of fluoride and1.7931 gram of chloride. Determine the mass percentage of fluorideand chloride in the compound.

c) determine the empirical formula of the original unknowncompound.

d) write a balanced chemical equation for the reaction ofzinc with the original unknown compound.

e) assuminf that your answer to part D is correct, what isthe minimun mass of zinc metal needed to react with niobiumcompound descrived above??

Please do not copy and paste answers from yahoo answers!!! Thoseanswers are not correct!! If I wanted answers from there I wouldget myself!!!! show work and answer all questions to get fullpoints!! thank you!