Mole Conversions and Mass Calculations in Chemistry
Learn about calculating masses of elements and compounds, converting moles to grams, and determining the number of moles in given quantities of substances using the periodic table and molar masses in chemistry.
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Presentation Transcript
4th period Megan Avgustin Mateo Tuesday, December 1st Fill in the blanks below using a periodic table. Be sure to include units of g or amu on all masses. 1 atom of helium has a mass of ___________. 1 mole of helium contains __________________ atoms, and has a mass of ___________. 1 formula unit (molecule) of calcium chloride (CaCl2) has a mass of ___________. 1 mole of CaCl2contains _________________ formula units (molecules), and has a mass of ___________.
A mole is A counting unit Like a dozen! 6.022 x 1023pieces Atoms, molecules, puppies, etc If I have a mole of carbon It weighs 12.01 grams It is made up of 6.02 x 1023atoms If I have a mole of carbon dioxide It weighs 12.01 + 16.00 + 16.00 = 44.01 grams It is made up of 6.02 x 1023molecules It is made up of 6.02 x 1023x 3 = 1.806 x 1024atoms
Whats the deal with AMUs and grams? Molar mass: The mass of one mole of a substance, reported in grams per mole. The number 6.022 x 1023(Avogadro s number) isn t arbitrary! Chemists picked it for a reason Avogadro s number is that value is because it is the number that makes the atomic mass given on the periodic table convert easily to grams If one atom of a substance weighs 32 AMUs, one mole of that same substance will weigh 32 grams In other words, there are 6.02x1023AMUs in 1 gram
What is the mass of one mole of Sodium chloride? Water? Calcium? Calcium chloride? Sodium nitrate? Barium phosphate?
Mole Conversions Grams 1 mole = ____ grams Molar mass from periodic table Moles 1 mole = 22.4 L under specific conditions 1 mole = 6.022 x 1023 atoms or molecules Liters of gas under standard conditions Atoms or molecules
How many moles are in 55.6 grams of sodium? 74.34 grams of water? 972.8 grams of silver chloride? 2.65 grams of barium nitrate? 54.8 grams of copper II oxide? Use dimensional analysis and report your answers with units and the correct number of significant figures
How many grams are in 3.25 moles of water? 65.3 moles of sulfur? 6.5 moles of silver chloride? 8.20 moles of barium nitrate? 0.5 moles of copper II oxide? Use dimensional analysis and report your answers with units and the correct number of significant figures
How many atoms are in 3.25 moles of water? 65.3 moles of sulfur? 6.5 moles of silver chloride? 8.20 moles of barium nitrate? 0.5 moles of copper II oxide? Use dimensional analysis and report your answers with units and the correct number of significant figures
How many molecules are in 55.6 grams of sodium chloride? 74.34 grams of water? 972.8 grams of silver chloride? 2.65 grams of barium nitrate? 54.8 grams of copper II oxide? Use dimensional analysis and report your answers with units and the correct number of significant figures
How many atoms are in 5.76 moles of sodium? 5.76 moles of sodium chloride? Use dimensional analysis and report your answers with units and the correct number of significant figures
How many grams are in 8.2 x 1024atoms of sulfur? 9.64 x 1022molecules of water? 3.45 x 1032molecules of hydrogen gas? Use dimensional analysis and report your answers with units and the correct number of significant figures
Formula of a Hydrate Pre-Lab Read the pre-lab discussion Define hydrate and anhydrous in your notebook in your own words Copy steps 1-5 into your notebook Complete the prelab question Flow-chart the procedure Create a data table
