Moles Mass There is also a connection between 1 mole of a substance and mass of any element or compound. Use Molar Mass to convert between moles & mass.

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Presentation transcript:

Moles Mass There is also a connection between 1 mole of a substance and mass of any element or compound. Use Molar Mass to convert between moles & mass. Mass Unit = grams

Moles Mass Conversion Factor: 1 mol = molar mass (grams)

EXAMPLES: Moles to Mass 1. How many grams are in 5.42 moles of NaCl? 2. How many moles are in 83.6 grams of H2O?

EXAMPLES: Mass to Moles 3. How many grams of tin are in 7.9 moles of tin? 4. How many grams are in 3.34 moles of Na2CO3?

Percent Composition The purpose of percent composition is to allow a scientist to determine the percent of mass an element contributes to a whole compound.

Example #1 chlorine in KCl?  What is the percent composition of  Step 1:  Find the weight of the compound by using the molar mass  (1 x 39.098) + (1 x 35.453)  Molar Mass of KCl = 74.551 g

Example #1 Continue in KCl?  Step 2:  What is the percent composition of chlorine in KCl?  Step 2:  Find the weight of the PART you want by using the molar mass.  Cl = 35.453

Example #1 Continue KCl?  Step 3:  What is the percent composition of chlorine in KCl?  Step 3:  Use the percent composition formula (MEMORIZE) & round answer to 3 significant figures.  Formula: (Part/Whole) x 100  Work: %Cl = (35.453 / 74.551) x 100  Answer with correct sig figs: %Cl = 47.6%

Example #2  What is the percent composition of oxygen in KMnO4?

Example #3  Find the Percent Composition of Mg in MgCl2?

Example #4 element in Fe(NO3)3?  What is the percent composition of each element in Fe(NO3)3?