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IIIIIIIV Unit 5 – The Mole I. Molar Conversions. Molar Conversions n Molar Mass is a conversion factor to convert mass of any element or compound to moles.

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Presentation on theme: "IIIIIIIV Unit 5 – The Mole I. Molar Conversions. Molar Conversions n Molar Mass is a conversion factor to convert mass of any element or compound to moles."— Presentation transcript:

1 IIIIIIIV Unit 5 – The Mole I. Molar Conversions

2 Molar Conversions n Molar Mass is a conversion factor to convert mass of any element or compound to moles. n Or to convert moles to mass.

3 Molar Conversions molar mass (g/mol) MASS IN GRAMS MOLES NUMBER OF PARTICLES 6.02  10 23 (particles/mol) ÷ ÷ X X

4 Molar Conversion Examples n How many moles of carbon are in 26 g of carbon? 26 g C 1 mol C 12.01 g C = 2.2 mol C

5 Molar Conversion Examples n How many grams are there in 11.9 moles of chromium? 11.9 moles Cr 52.00 grams Cr 1 mole Cr = 619 grams Chromium

6 Molar Conversion Examples n How many moles are there in 98.3 grams of Al(OH) 3 ? Need Molar Mass of Al(OH) 3 = 78.01 grams/mole 98.3 grams Al(OH) 3 1 mole Al(OH) 3 78.01 grams = 1.26 moles

7 Molar Conversion Examples n Find the mass of 2.1  10 24 molecules of NaHCO 3. 2.1  10 24 molecules 1 mol 6.02  10 23 molecules = 290 g NaHCO 3 84.01 g 1 mol

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