Presentation on theme: "Review: Molar Mass of Compounds"— Presentation transcript:
1 Review: Molar Mass of Compounds Ex. Molar mass of CaCl2Avg. Atomic mass of Calcium = 40.08gAvg. Atomic mass of Chlorine = 35.45gMolar Mass of calcium chloride = (2) = _110.98______ g/mol CaCl220Ca 17 Cl 35.45
2 Practice Calculate the Molar Mass of calcium phosphate Formula = Ca3(PO4)2Masses elements:Ca = 40.08g/moleP = g/moleO = g/moleMolar Mass =(40.08 g/mole)(3) + (30.97 g/mole)(2) + (16 g/mole)(8)= g/mole
3 Mole Conversions Learning Target: Understand how molar mass relates to the number of moles and particles of a substance.
4 Particles (atoms, Formula units, molecules) Divide by 6.02 X 1023Multiply by 6.02 X 1023MolesMultiply by molar mass from periodic tableDivide by molar mass from periodic tableMass (grams)
6 Problem Type #1 – Moles to Mass Find the mass of mol of magnesium bromide..Find the molar mass of the compound:Make the conversion:
7 Problem Type # 2– Mass to Moles A bottle of copper (II) nitrate contains g of compound. How many moles of copper (II) nitrate are in the bottle?
8 Problem Type #3 – Moles to Particles Determine the number of atoms that are in 0.78 mol of mercury.
9 Problem Type #4 – Particles to Moles How many moles of zinc sulfate contain 5.40 x 1024 formula units?
10 Multi-step Mole Conversions 2.5 g Roses = ?? atoms of rosesAtomic mass of 1 Rose is 3.0 g/mol
11 Multi-step PracticeHow many molecules are in 7.4 g of potassium phosphate?
12 Multi-step PracticeHow many grams of sodium bicarbonate are in 1.8 x 1023 formula units?
13 Molar VolumeDefinition: The volume of one mole of an ideal gas at standard conditions (STP) equal to 22.4 L.STP = standard temperature and pressure which is 0ºC and 1 atmospheric pressure (760 mmHg)1 mole gas at STP = 22.4 L
14 Particles (atoms, Formula units, molecules) Divide by 6.02 X 1023Multiply by 6.02 X 1023MolesMultiply by 22.4 LDivide by 22.4 LVolume (L)
15 PracticeA container with a volume of 563L contains how many moles of air at STP?How many molecules of air?
16 PracticeA chemical reaction produced 0.78 mol of H2 gas. What volume will the gas occupy at STP?How many molecules of H2?How many atoms of hydrogen?