Answered: An unknown compound containing…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter3: Equation, The Mole, And Chemical Formulas

Section: Chapter Questions

Problem 3.149QE

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1. An unknown compound containing tellurium and bromine is analyzed and it is determined that 28.53% of the compound by mass is composed of tellurium. Given that you have 0.2236 moles of tellurium and 0.8945 moles of bromine in the compound, determine the empirical formula of the unknown compound.

A) TeBr

B) Te₄Br₄

C) Te₄Br

D) TeBr₄

E) Te₂Br₂

2. Terephthalic acid is a chemical used to make polyesters, including disposable water bottles. It has the empirical formula C₄H₃O₂. The molar mass of terephthalic acid is 166 g/mol. What is its chemical formula?

A) C₄H₃O₂

B) C₁₂H₉O₆

C) C₈H₈O₈

D) C₈H₆O₄

E) C₁₀H₁₂O₈

3. To convert from grams to number of molecules, you need to use:

A) Avogadro's number

B) Molar mass

C) Density

D) Both (A) and (B)

E) None of the above

4. Write the chemical formula for tin(II) chloride dihydrate

5. Write the chemical formula for iridum(III) bromide tetrahydrate

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