Chem Catalyst1) How many grams does 3.24 mol of carbon weigh?

2) How many particles are in 3.24 mol of carbon dioxide?

Today’s Agenda:1. Catalyst2. Quiz3. Notes- percent composition

Percent Composition/Mass Percent- The percent by mass of each element in a

compound.

(mass of part) ÷ (mass of whole) x100

Percent CompositionWhen a 13.60g sample of magnesium oxide is

decomposed, 5.40g of oxygen are obtained. What is the percent composition of this compound?

1) Find the mass of each element.

2) Find the mass of the compound.

3) Calculate.

Percent CompositionWhen a 13.60g sample of magnesium oxide is

decomposed, 5.40g of oxygen are obtained. What is the percent composition of this compound?

Percent Composition: From Formula1) Find the total molar mass for each

element.2) Divide by molar mass of compound.3) Multiply by 100.

Percent Composition from FormulaFind the percent composition of propane

(C3H8).

Percent Composition from Formula: Your turn!Find the percent composition of iron (II)

oxide (FeO).

Find the percent composition of iron (III) oxide (Fe2O3).