Calculating Percent Yield

Chapter 10.3

Intro to Percent Composition

The number of percent values in the percent in the percent composition of a compounds is many as there are different elements in the compound

Which has a higher percent of chromium (Cr)?

Percent Composition

You can use percent composition to calculate the number of grams of an element in a given amount of a compound.

Empirical Formula

An empirical formula of a compound gives the simplest whole number ratio of the atoms of the elements in a compound

Empirical Formula

Empirical Formula ≠ Molecular Formula

Example

Empirical Formula: CH

C2H2

C4H4

C6H6

Fill in the labels

oxygen

6.02 x 1023

3 6.02

1

Molecular Formula

The molecular formula of a compound is either the same as its empirical formula or a whole number multiple of it.

Empirical Molecular

In order to calculate the molecular formula, you must know the compound’s molar mass

Empirical Molecular

If you divide the molar mass of a compound by the empirical formula mass you get the number that you will multiply the subscripts by