1, A mineral sample is obtained from a region of the country that has high arsenic contamination. An elemental analysis yields the following elemental composition: Element Atomic Weight (g/mol) Percent Composition Zn 65.409 23.4% As 74.9216 53.7% O 15.9994 22.9%

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Chapter1: Chemical Foundations
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1, A mineral sample is obtained from a region of the country that has high arsenic contamination. An elemental analysis yields the following elemental composition:

Element Atomic Weight (g/mol) Percent Composition
Zn 65.409 23.4%
As 74.9216 53.7%
O 15.9994 22.9%

 

What is the empirical formula of this mineral? 

Group of answer choices

ZnAsO4

Zn2AsO3

Zn2AsO4

ZnAs2O4

2.A mineral sample is obtained from a region of the country that has high arsenic contamination. An elemental analysis yields the following elemental composition:

Element Atomic Weight (g/mol) Percent Composition
Co 58.9332 21.2%
Fe 55.845 6.71%
As 74.9216 72.0%

 

What is the empirical formula of this mineral?

Group of answer choices

Co3FeAs8

Co2FeAs8

Co8FeAs3

CoFe3As8

CoFeAs

 

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