Please help me with tyhis problem and the right sig fig because I got as the molar of the compound 199.886 so I rounded to 200 and it was wrong so what is the correct mount of sig fig I should use? thanks

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 3.85QE: A chemist prepared a compound that she thought had the formula FeI3. When the compound was analyzed,...
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Please help me with tyhis problem and the right sig fig because I got as the molar of the compound 199.886 so I rounded to 200 and it was wrong so what is the correct mount of sig fig I should use? thanks

A compound has the chemical formula CaX2, where X is an unknown nonmetal. The
percent by mass of Ca in this compound is 20.05%. What is the molar mass of the
compound?
g/mole.
What is the nonmetal (write the element symbol)?
Transcribed Image Text:A compound has the chemical formula CaX2, where X is an unknown nonmetal. The percent by mass of Ca in this compound is 20.05%. What is the molar mass of the compound? g/mole. What is the nonmetal (write the element symbol)?
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