Mole Calculations 2.

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Presentation transcript:

Mole Calculations 2

Molar Mass The atomic mass of an element is the relative mass compared to Hydrogen. The unit is the atomic mass unit or amu. The molar mass is the mass of one mole of particles and the unit is grams/mole.

Formula Mass (amu) Molar Mass (g/mol) 1H 1.0 amu 1.0 g/mole 4.0 amu 4.0 g/mole He CO2

The molecular mass is the molar mass of a covalent Compound. CO2 1 ( 12.0 amu) + 2 (16.0 amu) = 44.0 amu

Formula Mass (amu) Molar Mass (g/mol) 1H 1.0 amu 1.0 g/mole 4.0 amu 4.0 g/mole He 44.0 amu 44.0 g/mole CO2 Fe2O3

The formula mass is the molar mass of an ionic compound. Fe2O3 2 (55.8 amu) + 3 (16.0 amu) = 159.6 amu

Formula Mass (amu) Molar Mass (g/mol) 1H 1.0 amu 1.0 g/mole 4.0 amu 4.0 g/mole He 44.0 amu 44.0 g/mole CO2 159.6 g/mole Fe2O3 297.4 g/mole Ni2(CO3)3 Al(NO3)3 .5H2O

Al(NO3)3 .5H2O 1 ( 27.0) + 3 (14.0) + 9 (16.0) + 10 (1.01) + 5 (16.0) Al N O H O 303.1 g/mole Note H is 1.01 due to 1H and 2H

Formula Mass (amu) Molar Mass (g/mol) H 1.0 amu 1.0 g/mole 4.0 amu 4.0 g/mole He 44.0 amu 44.0 g/mole CO2 297.4 g/mole Fe2O3 297.4 g/mole Ni2(CO3)3 303.1 g/mole Al(NO3)3 .5H2O

The molar mass is a new conversion factor that can convert between grams and moles Avogadro’s number is another conversion factor that can convert between moles and particles Particles Moles Grams 1.00 mole = 6.02 x 1023 particles Molar Mass From Periodic Table ? g / mole

Convert 56.6 grams of C to moles. x 1 mole = 4.72 moles 12.0 g Don’t forget sig figs! 3 sig figs

Convert 6.9 moles of PbO2 into grams x 239.2 g = 1.7 x 103 g 1 mole

Two Step Mole Calculations

Convert 2.00 g CH4 into molecules grams moles molecules 2.00 g CH4 x 1 mole x 6.02 x 1023 molecules = 7.51 x 1022 molecules 16.04 g 1 mole

Convert 9.56 x 1026 molecules Cl2 into grams. moles grams 9.56x1026 molec Cl2 x 1 mole x 71.0 g = 1.13 x 105 g 6.02 x 1023 molec 1 mole

Convert 692.5 grams Na2CO3 into formula units. g moles formula units 692.5 g Na2CO3 x 1 mole x 6.02 x 1023 FU = 3.93 x 1024 FU 106.0 g 1 mole

Convert 8.66 x 1024 formula units CaCl2 into grams formula units moles g 8.66 x 1024 FU CaCl2 x 1 mole x 111.1 g = 1.60 x 103 g 6.02 x 1023 FU 1 mole Happy Mole day to You