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Set PMG13: Determ'g Formula from % Composition 1

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Assignment Overview

Determine the empirical formula for a compound when given the percent composition of the element in the compound.  

 1. PMG13Q1
Points: 0/4

A compound contains only nitrogen and oxygen. Experimental evidence reveals that it is 74.0% by mass oxygen and has a molar mass of 108 g/mol. The empirical formula is NaOb where …

  1. … a is:

  2. … b is:

  3. The molecular formula is NcOd where …

    … c is:

  4. … d is:

 2. PMG13Q2
Points: 0/2

A compound containing only sulfur and oxygen is found to contain 57.19% sulfur and 42.81% oxygen. The molar mass of the compound is 224.26 g/mol. The molecular formula is SaOb where …

  1. … a is:

  2. … b is:

 3. PMG13Q3
Points: 0/4

A compound containing only carbon and hydrogen is found to contain 85.63% carbon and 14.37% hydrogen. It has a molar mass of 70.13 g/mol. The empirical formula is CaHb where …

  1. … a is:

  2. … b is:

  3. The molecular formula is CcHd where …

    ... c is:

  4. ... d is:

 4. PMG13Q4
Points: 0/3

A compound containing carbon, hydrogen, and oxygen is found to contain 71.39% carbon, 9.59% hydrogen, and 19.02% oxygen. The empirical formula is CaHbOc where …

  1. … a is:

  2. … b is:

  3. … c is:


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