1 step: Mol to mass conversions

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Presentation transcript:

1 step: Mol to mass conversions Unit 9: The Mole 1 step: Mol to mass conversions

What is the mass in mol to mass conversions? The mass comes from the molar mass of the element or compound. The mass of the substance is equal to 1 mole of that substance.

What is a mole? How many are in a pair? Dozen? Gross? Ream? What do these represent? A specific numerical value.

What is a mole? What is a mole? A mole is simply a unit of measure. 1 mole of a substance = the molar mass of the substance 1 mole of a substance = 6.02 x 1023 particles of that substance What is a mole?

Mass and the Mole: AMU: (atomic mass unit) is the mass of one nucleon (proton and neutron) Carbon’s AMU: 12g (12 protons and neutrons) How the mole came to be was calculated an isotope of Carbon-12. 1 mol = a substance’s AMU 1 mol of Carbon has an AMU of 12 grams. 1 mole of Carbon = 12 grams (why molar mass is g/mol – it is how many grams are in 1 mol) AMU is for an individual atom of an element Molar mass is all the AMU’s in a substance 1 Mole is 6.02 x 1023 particles and the molar mass of a substance: There are 6.02 x 1023 particles (atoms, formula units, molecules) of a substance in 1 mole of that substance There are 6.02 x 1023 particles in the molar mass of a substance. Every mole has a different mass value based on their AMU, because each atom has a different mass.

How to do 1 step mass to mol conversions: 1. find the molar mass of the substance… You will need this to complete the problem. 2. Solve using dimensional analysis. Remember identical units must be opposite of each other, so they can be cross cancelled. How many moles in 56.71g of water (H2O)? 56.71g H2O 1 mol H2O = 56.71 x 1 = 3.151 mols H2O 18g H2O 18 *Remember the molar mass of H2O is 18g/mol. (2 hydrogen atoms x 1 AMU + 1 oxygen atom x 16 AMU) = 18 g/mol

PRACTICE PROBLEMS

How many grams in 1.56 moles of Calcium Chloride?

How many grams can be found in 12.8 moles of Copper (II) Phosphate?

How many moles are in 15.6g of sulfur dioxide?

How many moles can be found in 456g of lithium carbonate?

How many mols of sodium is 3g?

How many mols of Fe is .05g?

How many mols of Beryllium is 1.60g?